Using GeoGebra Commands
Construction steps
- In the input bar enter: f(x)=x^2
- Add a new point A on the x-axis
- Add a new point B on the x-axis (to the right of A)
- In the input bar enter: a=x(A)
- In the input bar enter b=x(B)
- In the input bar enter Integral[f,a,b]