How to determine f(x) and g(x) for area between curves? So if I'm trying to figure out the area between two curves, I understand that the formula is: ∫ f(x) − g(x)dx But without them telling me which is f(x) and g(x), how do I tell which function is being subtracted and which is being subtracted from? For example I have the equations: x=2y2 and x=4+y2

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
6th Edition
ISBN:9781337111348
Author:Bruce Crauder, Benny Evans, Alan Noell
Publisher:Bruce Crauder, Benny Evans, Alan Noell
Chapter1: Functions
Section1.2: Functions Given By Tables
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How to determine f(x) and g(x) for area between curves?

So if I'm trying to figure out the area between two curves, I understand that the formula is: ∫ f(x) − g(x)dx

But without them telling me which is f(x) and g(x), how do I tell which function is being subtracted and which is being subtracted from?

For example I have the equations:

x=2y2 and x=4+y2

In this case my textbooks shows that the second equation is g(x) and the first is f(x), but why?

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