What is the input of the function when the output is 20?
It depends what the function is.
If the function is f(x) = 2x + 4 Then, to find out what the input is when the output is 20, substitute 20 in for f(x) and solve for x. 20 = 2x + 4 {substituted 20 in for f(x)} 16 = 2x {subtracted 4 from each side} x = 8 {divided each side by 2} The input would be 8, when the output is 20.....in this example. If you want to clarify your question, reply in the comment section of this post.
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