## anonymous one year ago .

1. anonymous

2. Astrophysics

Factor away

3. Astrophysics

|dw:1438607790118:dw|

4. Astrophysics

|dw:1438607800418:dw| first factor the red part, what do you get?

5. Astrophysics

So the question you should be asking is how to factor

6. Astrophysics

So for $x^2+4x-5$ the way you can do this is, find two number that add up to 4 and multiply to give -5. So what are the two numbers?

7. anonymous

im not sure

8. Astrophysics

-1 and 5, since -1+5 = 4, and -1 x 5 = -5...so we can write it as (x-1)(x+5) now you can try doing the other similarly or you can complete the square/ use quadratic formula $x = \frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }$ this is the quadratic formula where your express is as such $ax^2+bx+c$