Question

(y + 3) 2 − 6 = (y − 3)(y + 3) Помгите

Answer 1

Решение:

$(y+3)^2 - 6 = (y-3)(y+3)\\\\y^2+6y + 9 - 6 = y^2 - 9\\\\y^2+6y+3-y^2+9=0\\\\6y+12=0\\\\6y=-12\\\\y = -2$