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 9 as well and sum (Inside, Outside) to equal -6. For this problem, those two numbers are -3 and -3. Then, plug these into a set of binomials using the square root of the First variable (y²):

y² - 6y + 9
y² + (-3 - 3)y + (-3 x -3)
(y - 3)(y - 3)

To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)

-8a(a - x)
-8(-2)(-2 + 8)
-8(-2)(6)
(16)(6)
96

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 > sign and the answer on the other.

-2y + 1 > -6 - 3y
-2y > -6 - 3y - 1
-2y + 3y > -6 - 1
y > -7

A line on the coordinate grid can be defined by a slope-intercept equation: y = mx + b. For a given value of x, the value of y can be determined given the slope (m) and y-intercept (b) of the line. The slope of a line is change in y over change in x, \({\Delta y \over \Delta x}\), and the y-intercept is the y-coordinate where the line crosses the vertical y-axis.

The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)² : a = π r².