Casio fx-991EX - How to get out of weird i mode?

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kazakane
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I've been using my calculator but recently whenever I check polynomials, I get a weird i button. I've researched online and I've tried resetting my calculator but it's not working. I've checked what it is online and apparently it's complex numbers mode but I only need that for next year A level Maths?

Could someone pls help???
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Blue_Cow
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(Original post by kazakane)
I've been using my calculator but recently whenever I check polynomials, I get a weird i button. I've researched online and I've tried resetting my calculator but it's not working. I've checked what it is online and apparently it's complex numbers mode but I only need that for next year A level Maths?

Could someone pls help???
Press 'menu setup'. Should be the second button from the top-right, then press '1' and that should take you back to the normal calculation mode.
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kazakane
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Thanks you for your reply.
I tried it however, it just keeps coming up whenever I use it for complex polynmials. Someone said it means there are no real roots, is that true?

(Original post by Blue_Cow)
Press 'menu setup'. Should be the second button from the top-right, then press '1' and that should take you back to the normal calculation mode.
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RDKGames
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(Original post by kazakane)
I've been using my calculator but recently whenever I check polynomials, I get a weird i button. I've researched online and I've tried resetting my calculator but it's not working. I've checked what it is online and apparently it's complex numbers mode but I only need that for next year A level Maths?

Could someone pls help???
Your calculator will solve a quadratic and display the solutions. If they have 'i' then the solutions are complex ... not real.
Last edited by RDKGames; 1 month ago
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