SOLUTION: I hope someone can help me with this problem. I have the function f(x)=sqrt(x^2+81)-15. I need to find the places where the graph will cross the x-axis. I've tried to find the p
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Question 265650: I hope someone can help me with this problem. I have the function f(x)=sqrt(x^2+81)-15. I need to find the places where the graph will cross the x-axis. I've tried to find the points by using a graphing calculator, but it doesn't seem to be giving me the right results. Is there a way that I can do this without graphing it, so that I can figure out the correct answers? Any help will be greatly appreciated!
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The graph of a function crosses the 
-axis at places where the value of the function is zero. So set the function equal to zero and solve:
\ =\ \sqrt{x^2\,+\,81}\ -\ 15)
Square both sides:
John
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