Question 297339
Hint: We can rewrite {{{x^15}}} as {{{x^15=x*x^14=x*(x^7)^2}}}. This then means that {{{sqrt(x^15)=sqrt(x*(x^7)^2)}}}. From here, break up the square root to get {{{sqrt(x*(x^7)^2)=sqrt(x)*sqrt((x^7)^2)}}}. I'll let you take it from here.