factor the trinomial 9u^2+3u-20

Question

anonymous · Answer

http://www.mathsisfun.com/algebra/factoring-quadratics.html

hexagon001 · Answer

this is a polynomial, no?

anonymous · Answer

trinomial

hexagon001 · Answer

wait i googled it. i know what it is now

ryan123345 · Answer

Factors of 20
1,20
2,10
4,5

anonymous · Answer

I understand two numbers must multiply to equal -20 however they must both also add up to +3

jim766 · Answer

9u^2 + 3u -20      no GCF

(                )(                 )      what times what = 9u^2?

jim766 · Answer

9u^2 + 3u -20      no GCF

(                )(                 )      what times what = 9u^2?
(3u            )(3u             )     what two numbers mult to get 20?

jim766 · Answer

9u^2 + 3u -20      no GCF

(                )(                 )      what times what = 9u^2?
(3u            )(3u             )     what two numbers mult to get 20?

                                             1*20, 2 *10, 4*5   pick a pair and see if they work
(3u    5 )(3u       4)         3u*4 = 12u   
                                     5 * 3u = 15u    can you subtract these and get 3u?
                                                              yes
(3u  + 5)(3u  - 4 )          are the factors