anonymous
  • anonymous
Solve for x: 3 over 4 x + 5 over 8 = 4x
Mathematics
schrodinger
  • schrodinger
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welshfella
  • welshfella
|dw:1437764425692:dw|
welshfella
  • welshfella
multuply through by the LCM 8x
Haseeb96
  • Haseeb96
|dw:1437764448811:dw|

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welshfella
  • welshfella
|dw:1437764496079:dw|
anonymous
  • anonymous
|dw:1437732201178:dw|
welshfella
  • welshfella
you now need to solve the quadratic equation 32x^2 - 5x - 6 = 0
anonymous
  • anonymous
have no idea how to
welshfella
  • welshfella
ok you need to use the quadratic formula x = [ -b +/- sqrt(b^2 - 4ac)] / 2a where a , b and c are the coefficients in the equation ax^2 + bx + c = 0
welshfella
  • welshfella
so in our case we have a = 32, b = -5 and c = -6
welshfella
  • welshfella
plug these into the formula to find the values of x
welshfella
  • welshfella
so we have x = [-(-5) +/- sqrt(25 - 4*32*-6)] / 64
welshfella
  • welshfella
work that out on ur calculator.
welshfella
  • welshfella
there are 2 roots - one using the - and one using the +
anonymous
  • anonymous
am i solving whats in parenthesis ?
welshfella
  • welshfella
work out the parentheses first

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