Question

b) 7D + D + 4C + 8C - 8D - 120 =
c) 5y2 - 5x + 3 - 8y2 + 6x - 5 =​

Answer 1

Resposta:

B) 10

C) x = 3 ±√72 / 2

Explicação passo-a-passo:

B)

7D + D + 4C + 8C - 8D - 120 =

12C = 120

C = 120/12 = 10

C)

5y2 - 5x + 3 - 8y2 + 6x - 5

-5x + 6x + 5y² - 8y² +3 - 5

1x - 3Y² - 2 = 0

Δ = b² - 4*a*c

Δ = (-3)² * 4*1*(-2)

Δ = 9*-8

Δ= 72

x = (- b ±√Δ) / 2*A

x = 3 ±√72 / 2