# Revision history [back]

### plot of sine, parabola intersection works but solve makes no sense

When I plot a sine and parabola I get two obvious intersections

plot(x^2-5,-10,10,ymax=20) + plot(sin(x),-10,10)


But when I solve to get the two numeric x values, the answer makes no sense.

solve(x^2-5==sin(x),x)
[x == -sqrt(sin(x) + 5), x == sqrt(sin(x) + 5)][C:\fakepath\sinparabola.png](/upfiles/16030016023312979.png)


### plot of sine, parabola intersection works but solve makes no sense

When I plot a sine and parabola I get two obvious intersections

plot(x^2-5,-10,10,ymax=20) + plot(sin(x),-10,10)


But when I solve to get the two numeric x values, the answer makes no sense.

solve(x^2-5==sin(x),x)
[x == -sqrt(sin(x) + 5), x == sqrt(sin(x) + 5)][C:\fakepath\sinparabola.png](/upfiles/16030016023312979.png)
5)]