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a) f(x)=x³+8
0=x³+8
x³=-8
x=-2
b) f(x)=2x²-8
0=2x²-8
x²=4
x=2 v x=-2
c)f(x)=8-2x²
0=8-2x²
x²=4
x=2vx=-2
d)f(x)=8-x³
0=8-x³
x³=8
x=2