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Step-by-step explanation:
(1) 2x-3x^2+7 , x=0
=2(0)-3(0)^2+7
=7
(2)2x-3x^2+7 , x=1
=2(1)-3(1)^2+7
=2-3+7
=6
(3)2x-3x^2+7 , x=-1
=2(-1)-3(1)^2+7
=-2-3+7
=2
(4)2x-3x^2+7 , x=-2
=2(-2)-3(-2)^2+7
=-4-12+7
=-7
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