Find any points of intersection of the graphs by the method of substitution.
The Attempt at a Solution
From the second equation I can solve for y:
Plug it into the first equation and simplify...
Multiply both sides by 2 to get rid of the fraction and get the radicals over to one side, square both sides
simplify and you get
I can find x=0 and that Is correct, but the other real root should be -3. I can graph the polynomial (x3-4x2-x+60) on my calculator and see that it has a root of -3 but how can I do it by hand? Any other way besides the rational roots test?