Question

a)-x² + 6x-5=0 (R:1, 5)

b)x²+2x-8=0 (R:2, -4)

se der pra responder agora...​

Answer 1

Resposta:

a) (1, 5)

b) (2, -4)

Explicação passo-a-passo:

a) -x² + 6x - 5=0

x² - 6x + 5 = 0

delta

d² = 36 - 20 = 16

d = 4

as raizes

x1 = (6 + 4)/2 = 10/2 = 5

x2 = (6 - 4)/2 = 2/2 = 1

b) x² + 2x - 8 = 0

delta

d² = 4 + 32 = 36

d = 6

as raizes

x1 = (-2 + 6)/2 = 4/2 = 2

x2 = (-2 - 6)/2 = -8/2 = -4