SOLUTION: {{{x^2=21-sqrt(x^2+9)}}}. Need help with this equation please

Algebra ->  Radicals -> SOLUTION: {{{x^2=21-sqrt(x^2+9)}}}. Need help with this equation please      Log On


   

Question 852787: x%5E2=21-sqrt%28x%5E2%2B9%29. Need help with this equation please
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x^2-21+sqrt(x^2+9)=0
x=4 x=-4
check
16-21+5=0
ok