Question

Which expression is equivalent to 9x – (x – 8)(x + 1) + 10x?

-x^2 + 19x + 8
-x^2 + 26x + 8
8x^2 +10x + 8
8x^2 +26x + 8

Answer 1

option 2

Explanation:

9x – (x – 8)(x + 1) + 10x

9x – (x² + x — 8x — 8) + 10x

9x – (x² — 7x — 8) + 10x

9x – x² + 7x + 8 + 10x

-x² + 26x + 8

Answer 2

-x^2 + 26x + 8

Explanation:

9 x - (x - 8) (x + 1) + 10 x is always equal to -x^2 + 26 x + 8