Question

As raizes da função y =x2 -8x 15 e ?

Answer 1

Vamos là.

x^2 - 8x + 15 = 0

x^2 - 8x = -15

x^2 - 8x + 16 = 16 - 15

(x - 4)^2 = 1

x - 4 = 1, x = 5

x - 4 = -1 , x = 3 (D)