It is -5*sqrt(X - 15) which is an expression which cannot be simplified nor solved.
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√5 x √15 = 8.66025404
It seems to be 25. Call your number "x". x = 5 square root of (5 square root of (5 ...) Square it; this will eliminate the outermost square root sign: x squared = 25 times 5 square root of (5 square root of (... Dividing the second equation by the first one, you get: x squared / x = 25 x / x x = 25
15 is the square root of 225 (15 x 15 = 225).
3 x 5 = 15
5 - x^2 = (the square root of 5 minus x)(the square root of 5 plus x)