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x^3 = 64 = 0
x^3 = -64
x^3 = (-4)^3
x = -4
b)
x(x^2 - 16) = 0
x(x + 4)(x - 4) = 0
x = 0 v x = -4 x = 4
c)
x(x^2 + 2x + 1) = 0
x = 0
lub
x^2 + 2x + 1 = 0
D(delta) = 4 - 4 = 0
xo = -2/2 = -1
x = -1 v x = 0
d)
x^2 - 8x + 12 = 0
D = b^2 - 4ac = 64 - 48 = 16
VD = 4
x1 = (-b-VD)/2a = (8-4)/2 = 2
x2 = (-b+VD)/2a = (8+4)/2 = 6
x = 2 v x = 6