Question

http://www.sketchtoy.com/38622561 What do I do next? @Mertsj

Answer 1

Are you trying to factor?

Answer 2

http://www.sketchtoy.com/38623399

Answer 3

Pick out the factors of 15 that add up to -8

Answer 4

Whaaaa?

Answer 5

I'm confused.

Answer 6

Do you see that I wrote a list of factors of 15?

Answer 7

Yes, but none of the products are -8 > . <

Answer 8

The first pair of factors is 1 x 15
But the sum of 1 and 15 is 1+15 which is 16 and is NOT -8

Answer 9

We are looking for the factors of 15 that DO add up to -8

Answer 10

Which pair of factors is that...the pair that add up to -8

Answer 11

Oops.. it's -3 and -5

Answer 12

Very good. That means that the factors are (x-3)(x-5)

Answer 13

http://www.sketchtoy.com/38627607 Like this??

Answer 14

@jim_thompson5910 ??

Answer 15

if you're trying to factor x^2 - 8x + 15, then it comes out to be (x-3)(x-5)

not sure how you got the x or 2x^2

Answer 16

Ok, thank you.

Answer 17

yw

Answer 18

you can check your answer by expanding/FOILing out (x-3)(x-5) and you will get x^2 - 8x + 15 back again