Question

determine as raízes da equação 4x2-4x+1=9

Answer 1

-(-4)±√(-4)²-4.4.(-8) /2.4
4±√16+128 /8
4±√144 /8
4±12 /8

x' = 4+12 /8 = 16/8 = 2
x" = 4-12 /8 = -8/8 = -1