Question

Given
a = -4, b = -4 and c = -5
work out
b² - 2ac

Answer 1

⇒Plug in the values given in places and simplify.

`=(-4)^(2) -2(-4)(-5)\\=16-2(20)\\=16-40\\=-24`

-24 is the answer after substitution of the known values.

Answer 2

-24

Explanation:

b²-2ac

1. (-4)²-2(-4)(-5)
2. 16-40
3. -24