SOLUTION: Please help me. Use the square root property to solve the equation. x square = -81 Thanks, thanks, thanks

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Please help me. Use the square root property to solve the equation. x square = -81 Thanks, thanks, thanks      Log On


   

Question 316777: Please help me. Use the square root property to solve the equation.
x square = -81
Thanks, thanks, thanks
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

x%5E2=-81 Start with the given equation.


x=%22%22%2B-sqrt%28-81%29 Take the square root of both sides.


x=sqrt%28-81%29 or x-0=-sqrt%28-81%29 Break up the "plus/minus" to form two equations.


x=9i or x-0=-9i Take the square root of -81 to get 9i. Note: i=sqrt%28-1%29


So the solutions are x=9i or x-0=-9i