Question

Упростите выражение: 3(y-1)^2+6y

Answer 1

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$3 {(y - 1)}^{2} + 6y = 3( {y}^{2} - 2y + 1) + 6y = \\ = 3 {y}^{2} - 6y + 3 + 6y = 3 {y}^{2} + 3$
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Применили формулу квадрата разности:

${(a - b)}^{2} = {a}^{2} - 2ab + {b }^{2}$
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Answer 2

3(y-1)²+6y=3(у²-2у+1)+6у=3у²-6у+3+6у=3у²+3.