anonymous
  • anonymous
Quadratics
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
2x^2 - x + 1=0
welshfella
  • welshfella
you need to solve this?
anonymous
  • anonymous
yeah

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anonymous
  • anonymous
is there a formula or do i just work it out to find x
welshfella
  • welshfella
well first thing is it won't factor so you need to use the quadratic formula and complete the square
welshfella
  • welshfella
quadratic formula is x =[ -b +/- sqrt(b^2 - 4ac)] / 2a
anonymous
  • anonymous
i got 0.91 and -0.41
anonymous
  • anonymous
is that correct?
SolomonZelman
  • SolomonZelman
\(\large\color{black}{ \displaystyle 2x^2-x+1 =0 }\) I am assuming you aren't planning to complete the square for this one (it's possible but is probably the hardest method here). So either factoring or quadratic formula. lets find the descriminant first. \(\large\color{black}{ \displaystyle \sqrt{(-1)^2 -4\cdot 2 \cdot 1 } =\sqrt{1-8}=\sqrt{-7}}\)
SolomonZelman
  • SolomonZelman
your solutions are imaginary (no real solutions)
anonymous
  • anonymous
so they are wrong?
SolomonZelman
  • SolomonZelman
yes, your answers are incorrect.
SolomonZelman
  • SolomonZelman
let me ask you, have you previously learned about \(i=\sqrt{-1}\) ?
anonymous
  • anonymous
no
SolomonZelman
  • SolomonZelman
so then (for you) it is no solution.

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