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Express 2x^2 +8x +7 in the form A(x+B)^2 + C, where A, B and C are constants

2x²+8x+7=2(x²+4)+7=2((x+2)²-4)+7=2(x+2)²-8+7=2(x+2)²-1A=2, B=2, C=-1

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