functions question
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f(x) = x^2 + 2x
how do i find the inverse of f(x)? -
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maths is agonising
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thank goodness for google.
http://www.analyzemath.com/inversefunction/Tutorials.html -
let f(x) be y then make x the subject lor
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To find inverse function, the general method goes like this...
Let y = f(x).
Then to find inverse function, let x be the subject instead of y, so manipulate until you get x = .... -
http://www.analyzemath.com/inversefunction/Tutorials.htmlOriginally posted by aiglosicicle:f(x) = x^2 + 2x
how do i find the inverse of f(x)?
the website shows a v gd example. -
f(x) = x^2 +2x
y = (x+1)^2 -1 <--- complete the square
x = +- squareroot(y+1) -1
so.. inverse function is +- squareroot(x+1) -1
but first you must check whether your function is 1 to 1. in this case it isnt so there must be restricted domain