Find the value of the polynomial 2x-2x3+7 using given value for x=3,x=-1
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given x=3 and x=-1
when x=3 , substituting x=3 in the given polynomial
we get, 2(3)-2(3)3+7
=6-2(27)+7
=6-54+7
=-41
when x=-1, we get
2(-1)-2(-1)3+7
-2+2+7
0+7=7
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