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f´´(x)=6x+4
f´(-1)=2
f(2)=5
f(x)=....
f´(x)=3x²+4x-1
f(x)=x³+2x²-x-9
f´(x)=3x²+4x-1
f´(-1)=3(-1)²+4(-1)-1
=3(1)-4-1
=3-4-1
=-1-1
=-2
f(x)=x³+2x²-x-9
f(2)=(2)³+2(2)²-2-9
=8+2(4)-2-9
=8+8-2-9
=16-2-9
=14-9
=5
Pilihan C.
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