Casio fx-CG100 for Further Maths
Menus differ from the CG50. Use model-specific instructions rather than copied keystrokes.
Comparing the fx-CG100 and fx-CG50
Introduced in June 2025. Ordinary calculator-permitted papers still require the specified mathematical argument.
Use Graph Solve on the CG100
Find the intersections of y = x² and y = x + 2.
- Open Graph&Table and enter x² and x + 2 on the Function tab. Enable both functions.
- Draw the graphs and use View Window to include x from −3 to 3 and y from −1 to 6.
- On the graph, open Tools, choose Graph Solve and then Intersection.
- Select the relevant graphs if prompted and move through the available intersection results.
Expected result: The intersections are (−1,1) and (2,4).
The shared points satisfy both equations. Solve the equivalent quadratic x² − x − 2 = 0 to establish exact coordinates.
The viewing window controls what you can inspect. Check the model and software version before following a screen sequence.
Solve a quadratic in the CG100 Equation app
Check the roots of 2x² + x − 6 = 0.
- Open Equation. On the Type tab choose Polynomial.
- On the Degree tab select the quadratic form.
- On the Editor tab enter coefficients 2, 1 and −6.
- Calculate and read the roots on the Result tab.
Expected result: The roots are −2 and 3/2.
Expand (2x − 3)(x + 2) to check the polynomial. Both factors supply a root, and neither can be discarded.
This procedure is verified for software 2.00. Other software versions may change the screen sequence. A root display supplies no written factorisation or proof.
Before accepting an answer
Check angle mode, domain and the form requested. A decimal approximation does not replace an exact result, and a list of numerical roots does not show why every required root has been found.
For matrix work, confirm dimensions and multiplication order. For a probability, choose the tail and interpret it in context before deciding what the result means.
Use the linked manufacturer instructions for the exact screen and software version. Menu names differ between models.