Question

(a+2b+8)²-(a+2b)²=? a=1/8 b=-2

Answer 1

Formula: x²-y²=(x+y)(x-y)
(a+2b+8)²-(a+2b)²=(a+2b+8+a+2b)(a+2b+8-a-2b)=
=(2a+4b+8).8=16a+32b+64
a=1/8, b=-2, 16.1/8+32.(-2)+64=2-64+64=2