Question

Given b = 4 and c = -5, evaluate b² - c².

Answer 1

b^2-c^2 = (b+c) (b-c)

Answer 2

b^2-c^2=(b+c)(b-c)
I think you can do it now

Answer 3

b^2-c^2
=(4)^2-(-5)^2
=16-25
=-9