Casio Scientific Calculator - FX-991CW

Yes, the Casio fx-991CW+ is approved for use in every UK exam where a calculator is permitted.

The Natural Textbook Display shows mathematical expressions, fractions, and symbols exactly as they appear in textbooks, making them easier to read and understand.

Press the 'SHIFT' button, then the 'MODE' button (SETUP). Use the arrow keys to navigate to the angle setting and select the desired unit (DEG, RAD, or GRA).

Press 'MODE' and select 'EQN' (Equation mode). Choose the option for a quadratic equation (usually indicated by a symbol like ax²+bx+c=0). Enter the coefficients a, b, and c, then press '=' to find the solutions.

It means the calculator uses both solar energy and a battery backup. This ensures it functions reliably under various lighting conditions, especially important during exams.

Press 'SHIFT', then 'MODE' (SETUP). Navigate to 'CLR' (usually option 9) and select 'All' (option 1). Confirm by pressing '='.

Yes, the fx-991CW+ has functions for complex number calculations, including addition, subtraction, multiplication, and division of complex numbers.

Ensure the calculator is exposed to sufficient light for the solar panel. Check if the battery needs replacement if solar power is not enough. Press the 'ON' button.

Verify that the calculator is in the correct mode (e.g., degrees vs. radians). Ensure inputs match the Natural Textbook Display format. Reset the calculator to factory settings if problems persist.

Clean the calculator surface. If the issue continues, the calculator may require servicing. Try turning it off and on again.

Read the error message carefully. Consult the user manual for specific error code explanations and solutions. Often, this involves correcting the input or sequence of operations.