To add a complex number select the [b]Complex Number[/b] tool from the 2[sup]nd[/sup] button and click on the screen.[br][br]NB Complex Numbers will be added as z[sub]1[/sub], z[sub]2[/sub], ... a the variable z is reserved for 3D graphing.[br][br]You can also type [b]z_2=2+3i [/b]in the input bar and press enter to add the complex number [math]z_1=2+3i[/math] [br][b][br]p=z_1*z_2 [/b]will find the product.  [br][b]q=z_1/z_2 [/b]will find the quotient[br][br]The command [b]ComplexRoot[f][/b] will display the complex roots of a polynomial function.