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

Question

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

Answer 1

Y²-6y+9+3(y²-4)=9+4y²
y²-6y+9+3y²-12-9-4y²=0
-6y-12=0
y=-12/6=-2
Ответ: -2