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(2((x+1) ^3 – (x+1) ^2 + (x+1)) )+3
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(2((x+1) ^3 – (x+1) ^2 + (x+1)) )+3

User Sanurah
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1 Answer

4 votes
( x + 1 )^3 = x^3 + 3x^2 +3x + 1;
(x + 1 )^2 = x^2 + 2x + 1;
=> (2((x+1) ^3 – (x+1) ^2 + (x+1)) )+3 =2( x^3 + 3x^2 +3x + 1 - x^2 -2x - 1 + x + 1 ) + 3 = 2( x^3 + 2x^2 + 2x + 1 ) + 3 =
= 2x^3 +4x^2 +4x + 5.
User Caution
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