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.

4a⁵ - 3a⁵ = 1a⁵

The volume of a cylinder is πr²h:

v = πr²h
v = π(4² x 6)
v = 96π

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

b² + 5b - 36 = 0
(b - 4)(b + 9) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (b - 4) or (b + 9) must equal zero:

If (b - 4) = 0, b must equal 4
If (b + 9) = 0, b must equal -9

So the solution is that b = 4 or -9

The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 8 x 6) + (2 x 6 x 7) + (2 x 8 x 7)
sa = (96) + (84) + (112)
sa = 292

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 + 9)(y + 6)
(y x y) + (y x 6) + (9 x y) + (9 x 6)
y² + 6y + 9y + 54
y² + 15y + 54