Positive Function
I thought that when you divide by something, the inequality changes direction so why does root 2 keep the sign
I know that - root 2 changes the inequality but why not root 2
Q 2: http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20QP.pdf
and A:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20MS.pdf
I know that - root 2 changes the inequality but why not root 2
Q 2: http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20QP.pdf
and A:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20MS.pdf
Original post by esmeralda123
I thought that when you divide by something, the inequality changes direction so why does root 2 keep the sign
I know that - root 2 changes the inequality but why not root 2
Q 2: http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20QP.pdf
and A:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20MS.pdf
I know that - root 2 changes the inequality but why not root 2
Q 2: http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20QP.pdf
and A:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Basic%201%20MS.pdf
Not sure at what point you need to divide by root 2.... but obviously so you can divide by it without changing the sign of the inequality.
Original post by RDKGames
Not sure at what point you need to divide by root 2.... but obviously so you can divide by it without changing the sign of the inequality.
Does the inequality only change direction if you multiply or divide by a negative number
Original post by esmeralda123
Does the inequality only change direction if you multiply or divide by a negative number
Yes.
Quick Reply
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