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\(r = {\sqrt{8^2-15^2}}\)

 Nov 20, 2017
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r=sqrt(8^2 - 15^2)    Square both sides

r^2 =(8^2 - 15^2)

r^2 =(64 - 225)

r^2=-161 =-1 x 161 Take the sqrt of both sides

r =i sqrt(161)

r =12.688577 i

 Nov 20, 2017
edited by Guest  Nov 20, 2017

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