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anonymous

  • one year ago

Solve for x: 2 over 5 (x − 4) = 2x.

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  1. anonymous
    • one year ago
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    \[\frac{2}{5(x-4)}=2x\] multiply both sides by 5(x-4) \[\frac{2}{5(x-4)}*5(x-4)=2x*5(x-4)\]

  2. anonymous
    • one year ago
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    simplify 2=10x(x - 4)

  3. anonymous
    • one year ago
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    thx

  4. anonymous
    • one year ago
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    will you continue on your own?

  5. anonymous
    • one year ago
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    i forgot how to simplify

  6. anonymous
    • one year ago
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    how do you forget how to simplify

  7. anonymous
    • one year ago
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    idk i forgot

  8. anonymous
    • one year ago
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    can someone please help?

  9. campbell_st
    • one year ago
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    by simplifying all you need to do is ditribute the 10x so \[2 = 10x^2 -40x\] rewrite the equation and you get \[10x^2 - 40x - 2 = 0\] so you can now solve for x, using the general quadratic formula so make it a little easier, divide every term by 2 \[5x^2 - 20x - 1 = 0\]

  10. anonymous
    • one year ago
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    i got 13

  11. anonymous
    • one year ago
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    am i wrong?

  12. campbell_st
    • one year ago
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    well given its a quadratic equation, you need 2 answers... and you need the formula \[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\] you have a = 5, b = -20 and c = -1

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