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December 22, 2014

December 22, 2014

Posted by **Allie** on Thursday, November 20, 2008 at 2:04am.

- pre-calc -
**drwls**, Thursday, November 20, 2008 at 7:32amFirst rewrite the left side with a common denominator as:

[9x - 6(x+2)]/(3x^2+6x)

= (3x -12)/(3x^2+6x)

Then multiply the numerator and denominator of the right side by x. That does not change its value but gives you the same denominator on both sides. In that situation the numerators are equal, so

3x - 12 = 6x

3x = -12

x = -4

Check: -3/2 +6/12 =?= 6/-6 = -1 ok

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