The image shows how to store the value of C in a Casio calculator when solving a quadratic equation. The equation given is 2x² + 5x - 9 = 0, and we’re told that C = -9.
To store this value:
1. First, enter the number: press (-) then 9 → this gives you -9 on screen.
2. Then press SHIFT followed by STO (which is above the RCL button).
3. Now press the key labeled “C” — on most Casio calculators, this is the same as pressing ALPHA then the key with “C” written above it (often the ) or x⁻¹ key depending on model — but in this guide, they just say “select the letter C”.
After doing this, the calculator remembers that C = -9 for later use in calculations.
Since the task here is only about storing the value of C, and no further calculation is requested, the final answer is simply confirming what was stored.
Final Answer:
-9
Parent Tip: Review the logic above to help your child master the concept of equation calculator.
