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July 25, 2014

July 25, 2014

Posted by **Dot** on Tuesday, November 25, 2008 at 10:00am.

- algebra -
**Reiny**, Tuesday, November 25, 2008 at 11:08amI will assume you are trying to solve.

t^4-40t^2+40=0

I first solved for t^2 using the quadratic formula

to get t^2 = 20 +-√360

both of which are positive

then t = +-√(20 +-√360) which represents 4 answers

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