Answer: f(1)=21
Step-by-step explanation:
f(x-1)=x³+3x²-3x+7
f(x-1)=(x-1+1)³+3(x-1+1)²-3(x-1+1)+7
f(1)=(1+1)³+3(1+1)²-3(1+1)+7
f(1)=(2)³+3(2)²-3(2)+7
f(1)=8+3(4)-6+7
f(1)=8+12+1
f(1)=21
