Question

Evaluate 4(a2 + 2b) - 2b when a = 2 and b = -2.
DONE

Answer 1

4

Explanation:

Firstly simplify your brackets...,

; 4(a^2 + 2b) = 4a^2 + 8b...then substitute it onto the bracket

; 4a^2 + 8b - 2b

; 4a^2 + 6b....,then substitute with the given values of a and b

; 4(2)^2)+ 6(-2)

; 16 - 12 = 4