Factorising

[Dina_2]

Please help me factorise 9x^2-4a^2+4ay +y^2. I took out "-" as a common factor from - 4a^2+4ay +y^2 but I cannot factorise it further using difference of 2 squares.

 

[topsquark]

Please help me factorise 9x^2-4a^2+4ay +y^2. I took out "-" as a common factor from - 4a^2+4ay +y^2 but I cannot factorise it further using difference of 2 squares.

I can't make it factor, either. Are you sure it does?

Perhaps there's a typo? Look at the sign on the term $$4a^2$$.

-Dan

 

[Dr.Peterson]

Please help me factorise 9x^2-4a^2+4ay +y^2. I took out "-" as a common factor from - 4a^2+4ay +y^2 but I cannot factorise it further using difference of 2 squares.

I think the problem is supposed to be $9x^2-4a^2+4ay-y^2$, with the last term's sign changed. Check the original.