anonymous
  • anonymous
Solve –2x^2 +3x – 9 = 0 using the quadratic formula or completing the square method.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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mathteacher1729
  • mathteacher1729
Do you have a preferred method?
saifoo.khan
  • saifoo.khan
Try quadratic formula. it's easy.
anonymous
  • anonymous
whichever method is good.

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More answers

saifoo.khan
  • saifoo.khan
all 3 methods will give you the same answer.
anonymous
  • anonymous
completing the square method requires leading coefficent to be 1, and it works nicely if the "middle coefficient" is even. if not, use the quadratic formula (carefully) and be happy
anonymous
  • anonymous
\[x= -b \pm \sqrt{b ^{2}-4ac} /2a\] my teacher taught is a song .. its like the happy birthday song x is equal to negative b plus or minus the square root of b squared minus 4 a c all over 2 a
anonymous
  • anonymous
Does anyone know the answer??
anonymous
  • anonymous
http://au.answers.yahoo.com/question/index?qid=20100313194503AASfWpU that gives u the answer
mathteacher1729
  • mathteacher1729
How far did you get with this problem before you got stuck? Like... did you plug the numbers into the quadratic formula... then could not simplify them? Or did you not know how to substitute the appropriate numbers into the quad. formula? etc.
anonymous
  • anonymous
Jadadenay thanks for helping, but unfortunately that website doens't give me the correct answers.
anonymous
  • anonymous
what are the answer choices ?
anonymous
  • anonymous
Mathteacher1729 I'm not sure how to go about solving this equation at all since the x^2 is negative.
anonymous
  • anonymous
Jadadenay the answer choices are: a. x=3+-3i√7/4 , b.x=3+-9i√7/4 , c.x=-3+-3i√7/4 , d.x=-3+-9i√7/4
anonymous
  • anonymous
i believe its c
mathteacher1729
  • mathteacher1729
@dmartinez130 "since x^2 is negative"... That means that the coefficient of x^2 is -1. In other words, wherever you see "-x^2" you it means "(-1) times x^2". :)

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