Question

qual a raiz de x2-3x-4=0?

Answer 1

a = 1
b = -3
c = -4
Delta = (-3)² - 4.1.(-4) = 9 + 16 = 25
x' = (-(-3) + raiz(25))/2.1 = (3 + 5)/2 = 8/2 = 4
x'' = (-(-3) + raiz(25))/2.1 = (3 - 5)/2 = -2/2 = -1

S = {-1, 4}