Advanced Math/algebra Q

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Expert: Steve Holleran - 11/27/2007


Question
please solve:
2x squared +3x+8=0

Answer
Hi Alisa,

I don't know what level of algebra you are at, but to solve this you have to use the Quadratic Formula, since it is not factorable:

  2x^2 + 3x + 8  ---------> a = 2  b = 3  c = 8

so x = [-3 +/- sqrt(3^2 -4*2*8)] / 2(2)

  x = [-3 +/- sqrt(-55)] / 4 = -3 +/- i * sqrt(55)] / 4

where i = the imaginary unit, sqrt(-1)

So you get complex roots here.

Hope this helps you.

Steve

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Steve Holleran

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I can help with all math questions from basic math to Calculus. Whether it`s consumer questions, or questions from high school or college students, I have probably dealt with it at some time in my career.

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33 years teaching experience in NJ public schools

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B.S. Mathematics : Wake Forest University 1972 M.S. Mathematics : Monmouth University 1981

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