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I don't really know what this thing that I am doing is called, hence the reason I am asking here and not googling. I have a formula $0.5x(x + 1) = y$. And I am trying to convert it to a function which provides the x value based on the y value. I have the following function at the moment $x = (y / 0.5)/x - 1$. What do I have to do to remove the x variable on the right-hand side? Can you also tell me what this thing that I am doing is called so I'll have easier time googling.

Key Flex
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P_Andre
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    You have $y=f(x)$ and you are trying to find the inverse of the function $f$. However, I do not understand your formula. Your definition tells us that $x^2+x-2y=0$ and you can use the quadratic formula to find $x$ as a function of $y$ (note that there may sometimes be two values of $x$ that work for a single $y$). – lulu Jul 12 '18 at 11:33
  • What you are doing is called "finding the inverse of the function". – Paul Sinclair Jul 12 '18 at 22:56

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