Question

resolva:
(x+1) . (10-x) = 9x - 6

Answer 1

(x+1) . (10-x) = 9x - 6
=10x - x² + 10 - x=9x - 6
= - x² + 9x - 9x = - 6 - 10
= -x³ +0x=-16
= -x²= -16   (-1)
x²=16
x=$\sqrt{16}$
x=4

Espero ter ajudado...