Question

(2y + 5)2 - (y + 3)2 - 2.(6y + 7)

Answer 1

(2y + 5)2 - (y + 3)2 - 2.(6y + 7)

4y+10 - 2y+6 - 12y - 14

-10y +2

y=-2/-10

y = 0,2

Answer 2

(2y + 5)2 - (y + 3)2 - 2.(6y + 7)

2y .2 + 5.2 -2y -6 -12y + 14

4y + 10 - 14y +8

-10y + 18

y= 18 ÷(-10) = -1,8