Question

I need help factoring a couple of problems!!!

Answer 1

post

Answer 2

x2 – 8x + 15

Answer 3

Its (x-5)(x-3) but i dont know what to do after

Answer 4

Her's how you factor a trinomial:
1. Try to factor a common factor out of all terms if possible.
In your example, there is no common factor.

Answer 5

thats is these are the required factors

Answer 6

*it

Answer 7

2. If the trinomial is of the form x^2 + ax + b, then dollow the next steps.
In your case, you do have a trinomial of the form x^2 + ax + b, since the coefficient of the x^2 term is 1.

Answer 8

3. Look for two numbers that multiply to b and add to a.
In your case look for two numbers that add to 15 and add to -8

Answer 9

4. The numbers are -3 and -5
Write
(x )(x )
and fill in the balnks with the numbers, so you get
(x - 3)(x - 5)

Answer 10

Yea i got that so after i fill in the blanks i just put the whole problem together and solve?

Answer 11

You asked for help in factoring. The facoring is done.
x^2 - 8x + 15 = (x - 3)(x - 5)
If your problem was simply a factoring problem, you are done.

If your problem was to solve the equation, x^2 - 8x + 15 = 0, then after factoring you need to continue until you get a solution for x. In that case this is what you do:
x^2 - 8x + 15 = 0
(x - 3)(x - 5) = 0
x - 3 = 0 or x - 5 = 0
x = 3 or x = 5