Question 627464
{{{81 = 9^2}}} and {{{144 = 12^2}}}


So the square root of 81 is 9. The square root of 144 is 12


Therefore


{{{-sqrt(81/144) = -sqrt(81)/sqrt(144) = -9/12 = -3/4}}}


So


{{{-sqrt(81/144) = -3/4}}}


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