2(a+1)²-5(a+1)(a-1)+3(a-1)²

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2(a+1)²-5(a+1)(a-1)+3(a-1)²

2(a+1)²-5(a+1)(a-1)+3(a-1)²
2(a+1)²-5(a+1)(a-1)+3(a-1)²

2(a+1)²-5(a+1)(a-1)+3(a-1)²

=2(a+1)²-4(a+1)(a-1)+2(a-1)²-(a+1)(a-1)+(a-1)²
=8-2(a-1)
=10-2a