Question

(y-3)^2+3(y+2)(y-2)=9+4y^2

Answer 1

(y-3)²+3(y+2)(y-2)=9+4y²
у²-6у+9+3у²-12=9+4у²
4у²-4у²-6у=9-9+12
-6у=12
у=12:(-6)
у=-2