A-Level Maths I1-04 Locating Roots: Failure of the Change of Sign Method

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You deserve More subscribers than you have. My teacher is rubbish but I watch your videos and everything makes sense

jdbjdb
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i missed a week of school because of corona. this is so useful thank

codliver
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Thank you
I like how you verbally emphasize on important notes.

Hamza_Algmaty_
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Hey Jack, I just wanted to clarify, for the bottom row of graphs, you could add another graph where the a and b function values are positive, and you could have one root only, where the line is just touching the x axis. Is this assumption correct, and you did not include it for some reason, or is this assumption wrong?

By the way, your videos are my lifesaver for completing AS and A level Maths in just 1/2 a month. Very hard circumstances. Thanks a ton!!!!
😁

ibraheemmohammed