Question

-x elevado a 2 +8x-7=0

Answer 1

- x² + 8x - 7 = 0

A= - 1

B= 8

C= - 7

∆= b² - 4ac

∆= 8² - 4 • ( - 1) • ( - 7)

∆= 64 - 28

∆= 36

x= - b ± √∆ / 2a

x= - 8 ± √36 / 2 • (- 1)

x'= - 8 + 6/-2 = - 2/-2 = 1

x''= - 8 - 6/-2 = - 14/-2 = 7

S= ( 1 , 7)

Answer 2

Resposta:

x = 1

Explicação passo-a-passo:

-x ^ 2 + 8x -7

2+ 8x - 7 = 0

8x = 5

x=5/8

-x ^ 2+8.5/8 -7

-x ^ 0

1