A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.

The area of a parallelogram is equal to its length x width:

a = l x w
a = a x b
a = 4 x 3
a = 12

To factor a quadratic expression, apply the FOIL method (First, Outside, Inside, Last) in reverse. First, find the two Last terms that will multiply to produce -12 as well and sum (Inside, Outside) to equal 1. For this problem, those two numbers are -3 and 4. Then, plug these into a set of binomials using the square root of the First variable (y²):

y² + y - 12
y² + (-3 + 4)y + (-3 x 4)
(y - 3)(y + 4)

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.

6a⁶ - 2a⁶ = 4a⁶