Algebra Help Math Sheet

An Engineers Quick Algebra Reference

Algebra Math Help

Arithmetic Operations

The basic arithmetic operations are addition, subtraction, multiplication, and division. These operators follow an order of operation.

Addition

Addition is the operation of combining two numbers. If more than two numbers are added this can be called summing. Addition is denoted by + symbol. The addition of zero to any number results in the same number. Addition of a negative number is equivalent to subtraction of the absolute value of that number.

Subtraction

Subtraction is the inverse of addition. The subtraction operator will reduce the first operand (minuend) by the second operand (subtrahend). Subtraction is denoted by - symbol.

Multiplication

Multiplication is the product of two numbers and can be considered as a series of repeat addition. Multiplication of a negative number will result in the reciprocal of the number. Multiplication of zero always results in zero. Multiplication of one always results in the same number.

Division

Division is the method to determine the quotient of two numbers. Division is the opposite of multiplication. Division is the dividend divided by the divisor.

Arithmetic Properties

The main arithmetic properties are Associative, Commutative, and Distributive. These properties are used to manipulate expressions and to create equivalent expressions in a new form.

Associative

The Associative property is related to grouping rules. This rule allows the order of addition or multiplication operation on numbers to be changed and result the same value.

associative property

Commutative

The Commutative property is related the order of operations. This rule applies to both addition and subtraction and allows the operands to change order within the same group.

commutative property

Distributive

The law of distribution allows operations in some cases to be broken down into parts. The property is applied when multiplication is applied to a group of division. This law is applied in the case of factoring.

distributive property

Arithmetic Operations Examples

algebra operations 1

algebra operations 2

algebra operations 3

algebra operations 4

algebra operations 5

algebra operations 6

algebra operations 7

algebra operations 8

algebra operations 9

algebra operations 10

Exponent Properties

exponent addition property

exponent multiplication property

exponent multiply base property

negative exponent property

negative exponent with division property

exponent division propery

exponent of zero property

exponent fraction property

invert exponent property

fraction exponent

Properties of Radicals

radical property

double radical property

multiply radical property

divide radical property

exponent radical propery odd

exponent radical propery even

Properties of Inequalities

inequalities subtraction property

inequalities division less than property

inequalities division greater than property

Properties of Absolute Value

absolute value definition

negative absolute value property

absolute value zero property

absolute value multiply property

absolute value divide property

absolute value sum propety

Complex Numbers

Definition of Complex Numbers

Complex numbers are an extension of the real number system. Complex numbers are defined as a two dimension vector containing a real number and an imaginary number. The imaginary unit is defined as:

imaginary number definition

The complex number format where a is a real number and b is an imaginary number is defined as:

complex number format

Unlike the real number system where all numbers are represented on a line, complex numbers are represented on a complex plane, one axis represents real numbers and the other axis represents imaginary numbers.

Properites of Complex Numbers

definition of a complex number

format of complex numbers

property of the square of a complex number

property of a negative complex number

complex numbers addition property

complex numbers subtraction property

complex numbers multiplication property

complex numbers conjugate property

complex numbers absolute value property

complex numbers magnitude property

complex numbers absolute value squared property

Logarithms

Definition of Logarithms

A logarithm is a function that for a specific number returns the power or exponent required to raise a given base to equal that number. Some advantages for using logarithms are very large and very small numbers can be represented with smaller numbers. Another advantage to logarithms is simple addition and subtraction replace equivalent more complex operations. The definition of a logarithms is:

log and inverse log definition

Definition of Natural Log

natural log definition

Definition of Common Log

common log definition

Logarithm Properties

log of number equal to base property

log of one property

log of base raised to power property

base raised to log property

log power to multiplication property

log multiplication property

log divisin property

Factoring

Polynomials

A polynomial is an expression made up of variables, constants and uses the operators addition, subtraction, multiplication, division, and raising to a constant non negative power. Polynomials follow the form:

polynomial definition

The polynomial is made up of coefficients multiplied by the variable raised to some integer power. The degree of a polynomial is determined by the largest power the variable is raised.

Quadratic Equation

A quadratic equation is a polynomial of the second order.

quadratic equation

The solution of a quadratic equation is the quadratic formula. The quadratic formula is:

quadratic solution

Common Factoring Examples

quadratic factoring example 1

quadratic factoring example 2

quadratic factoring example 3

quadratic factoring example 4

cubic factoring example 5

cubic factoring example 6

cubic factoring example 7

cubic factoring example 8

Square Root

The square root is a function where the square root of a number (x) results in a number (r) that when squared is equal to x.

square root definition

Also the square root property is:

square root property

Absolute Value

absolute value properties 1

absolute value properties 2

absolute value properties 3

Completing the Square

Completing the square is a method used to solve quadratic equations. Algebraic properties are used to manipulate the quadratic polynomial to change its form. This method is one way to derive the quadratic formula.

completing the square

The steps to complete the square are:

  1. Divide by the coefficient a.
  2. Move the constant to the other side.
  3. Take half of the coefficient b/a, square it and add it to both sides.
  4. Factor the left side of the equation.
  5. Use the square root property.
  6. Solve for x.

Functions and Graphs

Expressions evaluated at incremental points then plotted on a Cartesian coordinate system is a plot or graph.

Constant Function

When a function is equal to a constant, for all values of x, f(x) is equal to the constant. The graph of this function is a straight line through the point (0,c).

constant function

Linear Function

A linear function follows the form:

linear function

The graph of this function has a slope of m and the y intercept is b. It passes through the point (0,b). The slope is defined as:

slope

An addition form for linear functions is the point slope form:

point slope

Parabola or Quadratic Function

A parabola is a graphical representation of a quadratic function.

quadratic function

The graph of a parabola in this form opens up if a>0 and opens down if a<0. The vertex of the parabola is located at:

parabola vertex

Other forms of parabolas are:

parabola other form

The graph of a parabola in this form opens right if a>0 or opens left if a<0. The vertex of the parabola is located

parabola vertex

Circle

The function of a circle follows the form:

circle definition

Where the center of the circle is (h,k) and the radius of the circle is r.

Ellipse

The function of an ellipse follows the form:

ellipse definition

Where the center of the ellipse is (h,k)

Hyperbola

The function of a Hyperbola that opens right and left from the center follows the form:

hyperbola definition

The function of a Hyperbola that opens up and down from the center follows the form:

hyperbola definition

Where the center of the hyperbola is (h,k), with asymptotes that pass through the center with slopes of:

hyperbola center

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