anonymous
  • anonymous
Solve for x: 2 over 5 (x − 4) = 2x.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
\[\frac{2}{5(x-4)}=2x\] multiply both sides by 5(x-4) \[\frac{2}{5(x-4)}*5(x-4)=2x*5(x-4)\]
anonymous
  • anonymous
simplify 2=10x(x - 4)
anonymous
  • anonymous
thx

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anonymous
  • anonymous
will you continue on your own?
anonymous
  • anonymous
i forgot how to simplify
anonymous
  • anonymous
how do you forget how to simplify
anonymous
  • anonymous
idk i forgot
anonymous
  • anonymous
can someone please help?
campbell_st
  • campbell_st
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 \[5x^2 - 20x - 1 = 0\]
anonymous
  • anonymous
i got 13
anonymous
  • anonymous
am i wrong?
campbell_st
  • campbell_st
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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