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EmilyJernigan

  • 3 years ago

Use the Quadratic Formula to solve the equation. -2x^2 - 5x + 5 = 0

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  1. Calcmathlete
    • 3 years ago
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    \[\LARGE Quadratic~Formula: x = \frac{-b ± \sqrt{b^2 - 4ac}}{2a}\]\[\large where,\]\[\large a = -2\]\[\large b = -5\]\[\large c = 5\]

  2. lopez_hatesmath
    • 3 years ago
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    http://www.wolframalpha.com/input/?i=-2x%5E2+-+5x+%2B+5+%3D+0

  3. waleed_imtiaz
    • 3 years ago
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    \[x= -b \pm \sqrt{b^{2}-4ac}/2a\] put the values

  4. EmilyJernigan
    • 3 years ago
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    Lopez.. my answers dont look like that on the site

  5. EmilyJernigan
    • 3 years ago
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    I still dont know how to do this.:/

  6. anonymous
    • 3 years ago
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    \[-2x^2 - 5x + 5 = 0\]multiply by \(-1\) to make life nicer get \[2x^2 + 5x - 5 = 0\]use \[x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\] with \[a=2,b=-5,c=5\]

  7. anonymous
    • 3 years ago
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    put the numbers in the slot,s, do the arithmetic carefully \[x=\frac{-(-5)\pm\sqrt{(-5)^2-4\times 1\times 5}}{2\times 2}\]

  8. lopez_hatesmath
    • 3 years ago
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    click on the alternate answers the answers are there

  9. lopez_hatesmath
    • 3 years ago
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    i got x approx -3.26556 and x approx 0.765564

  10. EmilyJernigan
    • 3 years ago
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    I tried to work it out and i still dont see my answer'

  11. EmilyJernigan
    • 3 years ago
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    |dw:1344713909733:dw| My answers look like this

  12. lopez_hatesmath
    • 3 years ago
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    what are your options?

  13. EmilyJernigan
    • 3 years ago
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    That was A... hold on.

  14. lopez_hatesmath
    • 3 years ago
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    -5+or- sqrt of 5 all over 2

  15. EmilyJernigan
    • 3 years ago
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    |dw:1344714110752:dw|

  16. EmilyJernigan
    • 3 years ago
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    Thats not an option

  17. Calcmathlete
    • 3 years ago
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    \[\implies x = \frac{-(-5) ± \sqrt{(-5)^2 - 4(-2)(5)}}{2(-2)}\]\[ \implies x = \frac{5 ± \sqrt{25 + 40}}{-4}\]\[\implies x = -\frac{5 ± \sqrt{65}}{4}\]\[\implies x = -\frac54 ± \frac{\sqrt{65}}{4}\]Do you see how I got that based on my first post?

  18. EmilyJernigan
    • 3 years ago
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    I think so. Thank you!

  19. Calcmathlete
    • 3 years ago
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    np :)

  20. lopez_hatesmath
    • 3 years ago
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    swaggg

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