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<-- TOOL -- > Select the Point-tool: (3rd-Button), (Shortcut: Ctrl+E).

Click at P to define a point there.

<-- TOOL -- > Define a Formula-Object:

Type somewhere the text-box {formula (a-x)^2*(x^2+y^2)-k^2*x^2}. Then select it and press the RETURN key.

<-- TOOL -- > Select the Screen-Rectangle-tool: (9th-Button/2nd-Button from below).

Click at A, drag ... , release at C to define the screen-rectangle m = (ABCD).

<-- TOOL -- > Select the Cartesian-Coordinates-tool: (Measures-Menu\Cartesian Coordinates_ ).

Click on P in order to define the group of its Cartesian coordinates x= ..., y=... .

<-- TOOL -- > Evaluate a Formula for a list of arguments. For this:

Right-click on Formula { (a-x)^2*(x^2+y^2)-k^2*x^2} and select the menu-item {Activate}. Then click on each number of the list: { 0.40} { -0.7143} { 2.5102} { 3.1000}, getting { 3.5541}.

<-- TOOL -- > Select the tool of Implicit-Restricted-Functions: (14th-Button/last item).

Click on point P, then on the number-object { 3.5541} and finally on screenrect m in order to find all points point P (inside the rectangle) such that z({ 3.5541}) is zero.

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