This is going to be a little tricky to explain online, but here it goes.

The final answer will be in the form of (x +/- ?)*(x +/- ?)

We're looking for two numbers that add up to -14 (the middle coefficient), and multiply together to get 40 (first coefficient multiplied by third coefficient). So here's a way to look at it:

(x+a)(x+b)

a+b=-14

a*b=40

The two numbers can be:

a=-4

b=-10

Answer: (x-4)(x-10)

If you have trouble thinking of these two numbers (-4 and -10), it can help by thinking of the two numbers multiplied together to get 40:

2*20=40

4*10=40

5*8=40

From these values, find the ones that could add or subtract to get a value of 14.

Let me know if you have any questions and I'll be happy to clarify anything. You may have learned a different way to solve this in class.

Wow UK what ur doing bro so I just have one quick question to ask u will it always be like smpeotive plus a postitive or could it be a positive plus a negative too?

haha I've been doing this for a lot of years. It can be a positive plus negative too, just as long as the numbers add up correctly and multiply together correctly. I think an example would be: x^2 - x - 6......(x+2)(x-3).. Is that what you're referring to?