1) f(2)
x=2
f=2*+2 = 2*4+2=8+2=10
2) f(-1)
x=-1
f=2*+(-1)=2*1-1=2-1=1
3) f(0)
x=0
f=2*+0=2*0+0=0
4)f(-3)
x=-3
f=2*+(-3)=2*9-3=18-3=15
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Answers & Comments
1) f(2)
x=2
f=2*
+2 = 2*4+2=8+2=10
2) f(-1)
x=-1
f=2*
+(-1)=2*1-1=2-1=1
3) f(0)
x=0
f=2*
+0=2*0+0=0
4)f(-3)
x=-3
f=2*
+(-3)=2*9-3=18-3=15