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TAG: algebra

Finding an inverse function

There is a procedure that people use and teach students to use for finding the inverse of a function. It goes like this (this image comes from page 10 of this document from Edexcel, but this pic is from Jo Morgan’s blog where I first saw it):

My problem with this is that it doesn’t make […]

Posted in How people learn (or don't), Thoughts about maths thinking | Tagged , |

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Things not sides

When doing algebra and solving equations, there is this move we often make which is usually called “doing the same thing to both sides”. For many people it is their fundamental rule of algebra. (It’s not mine, but that’s a discussion for another day.) You use it when solving an equation like this:
4x-3=13
4x-3 + 3 […]

Posted in Being a good teacher, Thoughts about maths thinking | Tagged , |

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