(x + 2)(x - 4)
= x^2 + 2x - 4x - 8
= x^2 - 2x - 8
Hi
24% of 80 is 19.2
100% ⇒ 80
24% ⇒ x
100x = 24·(80)
100x = 1920
x = 1920/100
x = 19.2
The answer is -20x, because the parentheses show they are being multiplied, so you multiply -10x and 2, which would be -20x.