Some wrong answers. For example , the roots of x^2 + x + 1 =0 are shown wrong. Looks as if the app has some issues with complex roots approximation (numerically). But it gives the real root(s) correctly. For example, it gives the real root of (x^3)+x-2=0 and (x^5)+x+1=0 correctly. To type higher powers of x , one can use combinations of x , x^2 and x^3 . Needs improvement towards resolving the demerits. The price of the app can be further increased with more added functionalities. Thanks ! 😁