Question

a) x2 - 64 = 0; b) x2 - 7 = 0; c) (x + 2)2 = 0; d) 6x2 = 5x *

Answer 1

Resposta:

a) x = 8

b)x = √7 = 2,64

c) x = - 8

d) x = 5/6

Explicação passo-a-passo:

a) x² - 64 = 0

x = √64

x = 8

b) x² - 7 = 0

x² = 7

x = √7 = 2,64

c) (x + 2)² = 0

x² + 2 . 1 . 2 + 2² = 0

x + 4 + 4 = 0

x + 8 = 0

x = -8

d) 6x² = 5x

6x = 5

x = 5/6