Question

Can someone help with B pls

Answer 1

see explanation

Explanation:

(b)

Given

x² - 8x + 20 = (x - 4)² + 4

(x - 4)² will be positive for all real values of x , except x = 4, where it will be zero.

Then (x - 4)² > 0, so

(x - 4)² + 4 > 0 , that is always positive