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September 18, 2014

September 18, 2014

Posted by **kasey** on Sunday, August 28, 2011 at 5:50pm.

(x+9) (x-9)

can you show and explain the steps

- Algebra -
**PsyDAG**, Monday, August 29, 2011 at 11:30am+9 * -9 = -81

x * -9 = -9x

x * 9 = 9x

x *x = x^2

9x-9x = 0

Answer: x^2 - 81

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