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January 28, 2015

January 28, 2015

Posted by **jennifer** on Sunday, September 21, 2008 at 5:30pm.

Z^2-18Z+81-25x^2

I have tried this one several times and just can't seem to get it.

please help

- intermediate algebra -
**Reiny**, Sunday, September 21, 2008 at 8:17pmthis is a variation of the difference of squares

Z^2-18Z+81-25x^2

= (z-9)^2 - (5x)^2

= (z-9+5x)(z-9-5x)

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