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Posted by **Amy** on Sunday, January 23, 2011 at 9:49pm.

2. (x)/(x^2-81)-(9)/(81-x^2) =

3. Let (-3,3) and (-6,_2) be points in the Cartesian plane. Find the distance between the points.

- Precalculus -
**Reiny**, Sunday, January 23, 2011 at 10:30pm((5x^-2)/(4x^2))^-2

= (5x^-2)(4x^2)^2

= (5x^-2)(16x^4)

= 80x^2

2. Do you realize that 81 - x^2 = -(x^2 - 81)

so (x)/(x^2-81)-(9)/(81-x^2)

= x/(x^2 - 81) + 9/(x^2 - 81)

= (x-9)/((x+9)(x-9))

= 1/(x+9) , x ≠ 9

- Precalculus -
**Reiny**, Sunday, January 23, 2011 at 10:30pmfor #3

you should have a formula for the distance between 2 points.

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