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December 19, 2014

December 19, 2014

Posted by **John** on Tuesday, November 6, 2007 at 5:31pm.

1. x^2-7x+12 / x^2-16 =

(x-3)(x-4) / (x-4)(x+4)

(x-4) cancels out

Answer (x-3)/(x+4)

2. x^2-3x+2/7x-14 divide by x^2-1/7x+7

x^2-3x+2/7x-14 * 7x+7/x^2-1

(x-1)(x-2)7(x+1)/7(x-2)(x-1)(x+1)

To me it looks like everything cancels out, is that possible?

- Algebra -
**drwls**, Tuesday, November 6, 2007 at 7:14pmThe first one is OK

[(x^2-3x+2)/(7x-14)]*[(7x+7)/(x^2-1)]

= [(x-2)(x-1)7(x+1)]/[7(x-2)(x-1)(x+1]

= 1

Looks like that is OK too.

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