book Maths Puzzle Numerical Ability

My question says to solve the equation and check the solution.
square root of x=15

Could you help me with this? thanks!

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book Other Question

p(x)=(x+x)^17


The degree of P is 17
its leading coefficient is __
and its constant term is 131072
Where ym is the time in sec needed to win for men, with x the Olympic year and x=0 corresponding to 1900. Find the year in which ym = 42.458