anonymous
  • anonymous
x^2 + 3x - 28 = 0
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
please answer this!
anonymous
  • anonymous
Factor it first.
anonymous
  • anonymous
my math teacher said not to factor first :/

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anonymous
  • anonymous
Have you learned the quadratic formula?
anonymous
  • anonymous
yeaa
anonymous
  • anonymous
\[x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}\] In this case a =1 , b = 3 and c = -28
anonymous
  • anonymous
like i no how to get this far. x^2 + 3x = 28 and i no that is the first step, then, you are supposed to cut the 3x in half and square it. but im confused because it is a prime and odd number!
anonymous
  • anonymous
What are you trying to achieve with that equation? Are you trying to find the zeros?
anonymous
  • anonymous
im trying to find the x and the directions say " solve by completing the square."
anonymous
  • anonymous
ahhh there you go now we can do something with that.
anonymous
  • anonymous
Visit this site. Hope it helps. http://www.purplemath.com/modules/sqrquad.htm
anonymous
  • anonymous
k thanks!

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