Help? Medal. and...*sighs* I'll fan you
The area of a the rectangular painting is given by the trinomial x^2+2x-15. What are possible dimensions? Use factoring

Question

Help? Medal. and...*sighs* I'll fan you
The area of a the rectangular painting is given by the trinomial x^2+2x-15. What are possible dimensions? Use factoring

romantic_ch3micals · Answer

...erm anyone?

mathmate · Answer

See: http://openstudy.com/study#/updates/5563dadee4b07daafb7ea498 At the end

romantic_ch3micals · Answer

...erm anyone?

romantic_ch3micals · Answer

...erm. I need help on this on. Besides, I don't think the teacher taught us this way.

mathmate · Answer

Well, you'd look for two factors of -15 that adds up to +2
Either you guess randomly, or you make a table:
-15*1 = -15   -15+1 = -14  
-5*3=-15    -5+3 = -2    but 5-3=+2, so try
5*(-3)=-15  5-3 = +2
So x^2+2x-15 = (x+5)(x-3)

Or you can use the method in the link if the coefficient is not one.