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

b² + 8b + 15 = 0
(b + 3)(b + 5) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (b + 3) or (b + 5) must equal zero:

If (b + 3) = 0, b must equal -3
If (b + 5) = 0, b must equal -5

So the solution is that b = -3 or -5

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

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(2a)(2ab) - (7a²)(9b)
(2 x 2)(a x a x b) - (7 x 9)(a² x b)
(4)(a¹⁺¹ x b) - (63)(a²b)
4a²b - 63a²b
-59a²b

A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.

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.

8a - 5a = 3a