write algebraic expression as a trig function

**jumpman23** · April 27th 2009, 05:18 PM

square root of 7x^2-448 x= 8sec theta

**Reckoner** · April 27th 2009, 05:50 PM

Originally Posted by jumpman23

square root of 7x^2-448 x= 8sec theta

I don't think you have expressed the problem very clearly. Are you trying to rewrite $\sqrt{7x^2-448}$ given $x=8\sec\theta?$ In that case, substitute, and note that $\sec^2\theta-1=\tan^2\theta.$

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