Algebra Help - Education Online
Algebra real numbers, formulas, linear and quadratic functions, exponent properties, products and factoring
The formula for computing the area of a rectangle is
This formula tells you that the area of a rectangle may be found by multiplying its length by its width. For example, the area of a rectangle 5 inches long and 2 inches wide may be found by substituting '5' for 'L' and '2' for 'W' in the formula and then multiplying:
A = 5 - 2 = 10
Hence the area of the given rectangle is 10 square inches.
If the rectangle is such that the length is the same as the width, the rectangle is called a square, and the formula for its area is
The numeral '2' is called an exponent. The expression 'W2' is a shorthand notation for
W - W
The set of all ordered pairs of real numbers (x, y) such that
y = x2
is a function. Some ordered pairs that belong to this function are:
(0,0) (+1, +1), (-1, +1), (+2, +4), (-2, +4)
The graph of this function is not a line; the function is not a linear function. it is an example of a quadratic function. Its graph is a parabola:
Another example of a quadratic function is the set of all ordered pairs of real numbers (x, y) such that
y = +2x2 + +5x + -1
If 'a', 'b', and 'c' are real numbers, and 'a' <> 0, then the set of all ordered pairs (x, y) such that
y = +ax2 + bx + c
is called a quadratic function. The properties of quadratic functions are studied in analytic geometry and calculus.
Continue Algebra Help with ....
Formulas, Functions, Graphs
Functions of Higher Degree
Properties of Exponents
Products and Factoring