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

b² - 7b - 8 = 0
(b + 1)(b - 8) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (b + 1) or (b - 8) must equal zero:

If (b + 1) = 0, b must equal -1
If (b - 8) = 0, b must equal 8

So the solution is that b = -1 or 8

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.

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.

(3a)(7ab) + (8a²)(2b)
(3 x 7)(a x a x b) + (8 x 2)(a² x b)
(21)(a¹⁺¹ x b) + (16)(a²b)
21a²b + 16a²b
37a²b

The formula for area is πr². Radius is circle \( \frac{diameter}{2} \):

r = \( \frac{d}{2} \)
r = \( \frac{6}{2} \)
r = 3
a = πr²
a = π(3²)
a = 9π

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).