solve the quadratic equation by factoring- x^2+9x-36=0... can someone do this, and give me step by step instructions please!! thax so much!1 xxx

Question

solve the quadratic equation by factoring-> x^2+9x-36=0... can someone do this, and give me step by step instructions please!! thax so much!1 xxx

barrycarter · Answer

You're trying to put the equation in the form (x-something)*(x-somethingelse)=0 -- does that help?

anonymous · Answer

not really, i havent done this in so long...

barrycarter · Answer

Well, if you had to guess at numbers for the two somethings, what would they be? Just take a wild guess at first

anonymous · Answer

What are two numbers that multiply to give 36, but either add or subtract to give 9.

anonymous · Answer

12 and -3?

anonymous · Answer

Yep.   (x+12)(x-3)

anonymous · Answer

You can check by FOIL'ing it out.

anonymous · Answer

thanks so much!