Answer:
18x - x^2 - 16
Step-by-step explanation:
10x - ((x - 4) (x - 4))
10x - (x - 4)^2
10x - (x^2 - 2x · 4 + 4^2)
10x - x^2 + 2x · 4 - 4^2
10x - x^2 + 8x - 16
(10x + 8x) - x^2 - 16
