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pythagoras123 Group Title

Find C and show your working (steps) \[\frac{C-100}{100}\] = \[\frac{2C-60}{C+60}\]

  • 2 years ago
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  1. inkyvoyd Group Title
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    Multiply both sides by 100(c+60)

    • 2 years ago
  2. inkyvoyd Group Title
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    solve for C, should be a quadratic

    • 2 years ago
  3. inkyvoyd Group Title
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    C cannot equal -60, becaue that would mean dividing by 0

    • 2 years ago
  4. saifoo.khan Group Title
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    \[\frac{C-100}{100} =\frac{2C-60}{C+60}\]Cross multiply.

    • 2 years ago
  5. saifoo.khan Group Title
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    \[(C-100) (C+60) = (2C-60)(100)\]Solve.

    • 2 years ago
  6. inkyvoyd Group Title
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    Foo foo give better answer

    • 2 years ago
  7. inkyvoyd Group Title
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    But still, make sure C=/=-60

    • 2 years ago
  8. saifoo.khan Group Title
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    First let him solve @inkyvoyd

    • 2 years ago
  9. inkyvoyd Group Title
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    I mean, ifthe answer comes out as -60, it won't be accurate, because the denominator is never equal to zero.

    • 2 years ago
  10. CoCoTsoi Group Title
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    (c -100)/100 = (2c-60)/ (c+60) denominator are 100 and c+60 LCM = 100(c+60) multiply both sides with 100(c-60) (c-100)(c+60) = (2c-60)(100) (c-100)(c+60) =c^2 +60c -100c -6000 =c^2 - 40c -6000 (2c-60)(100) =200c -6000 (c-100)(c+60) = (2c-60)(100) c^2 - 40c -6000= 200c -6000 c^2 -40c - 6000 - 200c = 200c -200c-6000 c^2 -240c=0 c(c-240)=0 c=0 or c=240

    • 2 years ago
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