Every operation has an opposite. With functions the opposite is called the inverse function. It undoes the function and returns you to the initial input.
There is a simple process to follow to find the inverse of any function which we look at in this video.
1) Start by writing the function as y=
2) Switch the x and y's around to get x =
3) Rearrange to make y the subject once more
4) You've found the inverse, so rewrite it as f^-1(x)
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Work through this practice GCSE / K12 question on atomic number, atomic mass and electronic configuration. Read the question, and hit pause if you want to try answering it yourself. Then hit play again to watch how the teacher solves it.
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This video is part of 'Chemistry for