Question

encontre a raizes de f(x) = x2 - 2x -15

Answer 1

Resposta:

x+ = 5  x- = -3

Explicação passo-a-passo:

Delta = b^2-4ac

Delta = -2^2-4.1.(-15)

Delta = 4+60

Delta = 64

x = -b+-raiz de delta/2a

x = -(-2)+-raiz de 64/2.1

x = 2+-8/2

x+ = 2+8/2

x+ = 10/2

x+ = 5

x- = 2-8/2

x- = 6/2

x- = -3