Question 550649
A perfect square is a number x such that {{{x=k^2}}} where k is some whole number.



For example, 100 is a perfect square because {{{100=10^2}}}. You can figure out if a number is a perfect square by evaluating the square root of that number. If the square root of that number is a whole number, then that number is a perfect square.


So {{{sqrt(100)=10}}} (which makes it a perfect square), but {{{sqrt(101)=10.0498756211209}}} (which makes it a non-perfect square)



The radical sign is just another way of saying the square root sign.



Note: keep in mind that x = -11 is also a solution along with x = 11