(y+3)²-3y²+2(y-1)²=13

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(y+3)²-3y²+2(y-1)²=13(y+3)²-3y²+2(y-1)²=13(y+3)²-3y²+2(y-1)&

(y+3)²-3y²+2(y-1)²=13
(y+3)²-3y²+2(y-1)²=13

(y+3)²-3y²+2(y-1)²=13
y²+6y+9-3y²+2y²-4y+2=13
2y+11=13
2y=2
y=1

y²+6y+9-3y²+2y²-4y+2=13
2y=2
∴y=1