Question

What are the roots of this function? f(x) = x2 – 8x + 12 A) {2, 6} B) {8, 12} C) {-3, -4} D) {-4, -4}

Answer 1

A.

Explanation:

delta =
`b^(2) - 4ac = (-8)^(2)-4*1*12 = 64 - 48 = 16`

`x_(1) = (b-√(delta))/(2a) = (8+4)/(2) = 6`

`x_(2) = (b+√(delta))/(2a) = (8-4)/(2) = 2`