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anonymous

  • one year ago

Quadratics

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  1. anonymous
    • one year ago
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    2x^2 - x + 1=0

  2. welshfella
    • one year ago
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    you need to solve this?

  3. anonymous
    • one year ago
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    yeah

  4. anonymous
    • one year ago
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    is there a formula or do i just work it out to find x

  5. welshfella
    • one year ago
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    well first thing is it won't factor so you need to use the quadratic formula and complete the square

  6. welshfella
    • one year ago
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    quadratic formula is x =[ -b +/- sqrt(b^2 - 4ac)] / 2a

  7. anonymous
    • one year ago
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    i got 0.91 and -0.41

  8. anonymous
    • one year ago
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    is that correct?

  9. SolomonZelman
    • one year ago
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    \(\large\color{black}{ \displaystyle 2x^2-x+1 =0 }\) 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. \(\large\color{black}{ \displaystyle \sqrt{(-1)^2 -4\cdot 2 \cdot 1 } =\sqrt{1-8}=\sqrt{-7}}\)

  10. SolomonZelman
    • one year ago
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    your solutions are imaginary (no real solutions)

  11. anonymous
    • one year ago
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    so they are wrong?

  12. SolomonZelman
    • one year ago
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    yes, your answers are incorrect.

  13. SolomonZelman
    • one year ago
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    let me ask you, have you previously learned about \(i=\sqrt{-1}\) ?

  14. anonymous
    • one year ago
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    no

  15. SolomonZelman
    • one year ago
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    so then (for you) it is no solution.

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