Factor...9r^2+11r+4

Question

Factor...9r^2+11r+4

anonymous · Answer

Two numbers, A and B multiply to get 9 times 4, and add to get 11:$$A*B=9*4=36$$$$A+B=11$$. What are A and B?

anonymous · Answer

9 and 4 right?

anonymous · Answer

Actually never mind, this has complex roots, meaning you need to use the quadratic formula.

anonymous · Answer

oh i see... sorry im no good at math :/.... so what do i do next?

anonymous · Answer

Do you know the quadratic formula?

anonymous · Answer

No I'm sorry i do not.

anonymous · Answer

$$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$doesn't look familiar?

anonymous · Answer

No it does not... i usually post problems i got wrong so prolly not knowing the formula is why i got it wrong.

anonymous · Answer

It's weird that your class would be doing complex numbers before doing that formula. Are you sure that there's no typo in the question?

anonymous · Answer

nope no typo i double checked... and yes it is weird

anonymous · Answer

I'm guessing your textbook / teacher has made a typo then. The information you need to solve this question is a few years beyond this type of factorising.

anonymous · Answer

Oh so it is to advanced for the stuff i should be doing

anonymous · Answer

i have the answer choice the trinomial is not factorable could that be it

anonymous · Answer

Yep.

anonymous · Answer

ok thanks man i really appreciate the help