[size=85] Enter the values of the coefficients [b]A[/b], [b]B[/b], [b]C[/b] and [b]D[/b] of the [i][b]Quartic polynomial[/b][/i] using the input fields and find its [b][color=#6aa84f]Roots[/color][/b]. The roots (are indicated in green) are calculated using the Geogebra command: ComplexRoot(f).[br] Graphical interpretation the [b][color=#93c47d]Roots[/color][/b]: the intersection of implicit functions, which are the [i]zeroed[/i] [u]real [/u]and [u]imaginary[/u] parts of the [b]complex function f(z)[/b], respectively: real(f(z))=0 and imaginary(f(z))=0.[/size]