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There is no operator between x2and 16.
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-1/(2*x2)
The derivative, with respect to x, is -x/sqrt(1-x2)
d/dx (x2+ 9)1/2= 1/2*(x2+ 9)-1/22x = x(x2+ 9)-1/2or x/(x2+ 9)1/2
x2 = 16take the root square for both sides the result will be :X = +4 or -4
The roots ARE the answer(s).x2 - 16 = 0Add 16 to each side of the equation:x2 = 16Take the square root of each side:x = -4 or +4 .