Question

6.(y-3)²=(y-9).(3-y)

Answer 1

6(y^2-6y+9)=(3y-y^2-37+9y)
6y^2-36y+54=y^2+12y-27
5y^2-48y-81=0

Answer 2

Boa noite

6 * (y - 3)² = (y - 9)*(3 -y)

6 * (y² - 6y + 9) = -y² + 12y - 27

6y² - 36y + 54 = -y² + 12y - 27
7y² - 48y + 81 = 0 

delta
d² = 48² - 4*7*81 = 36
d = 6

y1 = (48 + 6)/14 = 54/14 = 27/7
y2 = (48 - 6)/14 = 42/14 = 3