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f(x)=3x²-x³
f⁻¹(x)=6x-3x²
f(x)=3x²-x³
f(-2)=3(-2)²-(-2)³
=3(4)-(-8)
=12+8
=20
f(-1)=3(-1)²-(-1)³
=3(1)-(-1)
=3+1
=4
f(0)=3(0)²-(0)³
=3(0)-(0)
=0
f(1)=3(1)²-(1)³
=3(1)-(1)
=3-1
=2
f(2)=3(2)²-(2)³
=3(4)-(8)
=12-8
=4
Nilai maksimum adalah 20
Pilihan E.
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