exam Maths Puzzle Numerical Ability

Square root of x2 -15 minus square root of x+5=0

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exam Other Question

You know that subtracting 15 times a number from twice the square of the number results in an answer of -27. How do I write the equation to represent this? f(x) = (1 + x)/x
g(x) = 1/(1 - x)
h(x) = 1/(1 + x)
If so, (g o h)(x) =

a. x
b. 2 - x
c. -x
d. x/(2x + 1)
e. (1 - x)/(2 - x)
f. (1 + x)/x
g. (2 - x)/(1 - x)