Question

What is the value of b2 - 4ac for the following equation? x(x + 8) = 9

Answer 1

Not sure if this is what you are asking for but hope it helps.

Answer 2

100.

Explanation:

`x(x+8) = 9`

`x^2+8x = 9`

`x^2+8x-9 = 0`

In that formula we have that a = 1 (coefficient of x^2), b = 8 (coefficient of x) and c= -9 (independent term). Then,

`b^2-4ac = 8^2-4(1)(-9) = 64+36 = 100`.