f(x)=-sqrt(x^2-25)

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Solution for f(x)=-sqrt(x^2-25) equation: 


Simplifying
f(x) = -1sqrt(x2 + -25)

Multiply f * x
fx = -1sqrt(x2 + -25)

Reorder the terms:
fx = -1qrst(-25 + x2)
fx = (-25 * -1qrst + x2 * -1qrst)
fx = (25qrst + -1qrstx2)

Solving
fx = 25qrst + -1qrstx2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = 25qrstx-1 + -1qrstx

Simplifying
f = 25qrstx-1 + -1qrstx

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