Question

9(x-2y)^2+36(x-2y)(x+y)+36(x+y)^2

Answer 1

Answer:

achha se likho question

Answer 2

In complex factorization like this, we may set two letters and factorize. You may think there is an error, but it is not.

There is no error in this method because the expression does not change.

Set two letters. Any letters except x, y will be okay.

$\boxed{9A^2+36AB+36B^2}$

It is a complete square!

$\boxed{(3A+6B)^2}$

Now we return the letters.

$\boxed{(3x-6y+6x+6y)^2}$

→ $\boxed{(9x)^2}$