To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

8a⁶ - 3a⁶ = 5a⁶

The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.

To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses:

(y + 4)(y - 8)
(y x y) + (y x -8) + (4 x y) + (4 x -8)
y² - 8y + 4y - 32
y² - 4y - 32

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.

-4c - 8 = 7 - 5c
-4c = 7 - 5c + 8
-4c + 5c = 7 + 8
c = 15

A trapezoid is a quadrilateral with one set of parallel sides.