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How do I find X in the simplest radical form

How do I find X in the simplest radical form-example-1
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User Myradio
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Let's do #2:

Leg lengths are 7 and 9, and hypo length is x. Find x. Use the Pyth. Thm. as follows:

x = sqrt(7^2+9^2) = sqrt(49+81) = sqrt(130) (answer)
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User InLaw
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