Question

36x^2-21x-30 factor

Answer 1

Easy...

to even begin to factor..you must factor out a 3, to simplify your answer.

3(12$x^{2}$-7x-10)

Now, you can factor.

$3(12 x^{2} -7x-10)$

So..to find the answer...

12*-10=-120x
and 
you would use -7x

What multiplies to -120..but adds to -7?

-15*8=-120
and
-15+8=-7

To find the answer, plug in what you know..

3(3x+2)(4x-5)

Thus, your answer.