Thread: need help factoring a problem

9x^2y^2+5xy-4

I dont really even know where to begin

My book doesnt explain what to do with this kind of problem at all. I mean it does talk about factoring trinomials, but when its setup this way its a bit confusing, and different

any help is appreciated.

It is a tricky one.

Maybe before trying this one, have a go at

Can you do it?

yeah I would rewrite the problem as

(9a2 + 9a)(-4a - 4)
9a(a + 1) -4(a+1)
(9a-4)(a+1)

Good; do same with yours, after letting y=1 ; get it?

Originally Posted by Wilmer

Good; do same with yours, after letting y=1 ; get it?

unfortunately im a little confused by what you mean lol

Originally Posted by NecroWinter

unfortunately im a little confused by what you mean lol

Ok so heres what I think I should do with that, if someone can fix my train of thought i think that would help me correct the errors.

9x^2y^2+9x-4x-4
add ()'s
(9x^2y^2+9x)(-4x-4)

(9x^2y^2+9x)
9x(y^2 + 1)-4(x+1)

this would be so much better if my book actually talked about factoring trinomials when you have exponents set up this way, outside the norm

i also tried something like this but it just didnt look right at all:
9(xy)^2+5(xy)-4

9xy(1^2 +1) -4(1(xy) +1)

you're really making this much more difficult than it needs to be ...

pickslides had you factor for a reason.



compare the factorization with above to the factorization with below ...



see the similarity?

Okay I gotcha. Thanks

Is this typically how you guys tackle these kinds of problems? Will simply substituting(for a lack of a better word) make me run into a problem later on?

can't say ... depends on the problem.