How do i factor this?

5-4x-12x^2

Question

How do i factor this?

5-4x-12x^2

anonymous · Answer

I'm not sure how to explain to you on how to factor, but I can tell you what it's suppost to look like.

anonymous · Answer

Anything will help. I am so confused with this.

anonymous · Answer

The answer should come out to be -(2x-1)(6x+5) but it would definately be more help to you if I could explain it. Sorry hun :/

anonymous · Answer

that's what I got but it said it's wrong! I didn't have the negative in front tho..

raden · Answer

factorization actually is easy, but hard to explain it 
5 * 1 = 5
6x * 2x = 12x^2
6x * 1 + 5 * -2x = 6x - 10x = -4x
so, 5-4x-12x^2 = (5+6x)(1-2x)

anonymous · Answer

oh my gosh, thank you! I had it all mixed up!

campbell_st · Answer

well start by taking -1 out as a factor

then you have a quadratic in the form 

$$ax^2 + bx + c = 0$$

$$-(12x^2 + 4x - 5) = 0$$

next multiply  a and c
12 * - 5 = -60     find the factors of -60 that add to 4   10 and - 6

so you need to write it as |dw:1360352494269:dw|

this method works every time...