Question

Qual o valor de x2+2x-15=0

Answer 1

Ola Pri

x² + 2x - 15

a = 1
b = 2
c = -15

delta
d² = b² - 4ac
d² = 2² - 4*1*(-15)
d² = 4 + 60 = 64
d = 8

x1 = (-b + d)/2a = ((-2 + 8)/2 = 6/2 = 3
x2 = (- b - d)/2a = (-2 - 8)/2 = -10/2 = -5 

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