Question

I'm stuck in between my answer. I am unable to get the answer further.

Answer 1

Answer:

after your steps ,

you got      $y^2+6y-27 = 0$    , right ?

now,

$y^2+6y-27 = 0$   ⇒ $(y+9)(y-3) = 0$

so , y = -9   or   y = 3

thus you got the answer !