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15 is the square root of 225 (15 x 15 = 225).
if x is equal to the square root of 81 then x is ±9 (plus or minus 9)
√5 x √15 = 8.66025404
Square root of 49 = 7... Square root of 9 = 3... 3 x 7 = 21
The square root of 81 is 9. 9 x 9 = 81.