Question

AJUDAAAA
Quanto é:
-7= x² -8x -7​

Answer 1

$- 7 = {x}^{2} - 8x - 7 \\ - 7 - {x}^{2} + 8x + 7 = 0 \\ - {x}^{2} + 8x = 0 \\ x( - x + 8) = 0 \\ x = 0 \\ - x + 8 = 0 \\ - x = - 8 \\ ( - 1) - x = - 8 \: ( - 1) \\ x = 8$