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FIND DOMAIN AND RANGE CALCULATOR HOW TO

Thus, the range is the possible outputs we can have here, that is, the flavors of soda in the machine.

No matter what amount you pay, you won't get a cheeseburger from a soda machine.

Hence, the domain represents the inputs we can have here, that is, quarters and one-dollar bills. The machine will not give you any flavor of the soda if pennies are input.

You can use quarters and one-dollar bills to buy a soda.

Domain and range are the main aspects of functions. Similarly, for functions, we input different numbers and we get new numbers as the result. When you put in a certain amount of money, you can select different types of sodas. Hence, using interval notation, we would write \(R(f) = [0, +\infty)\).Functions in mathematics can be compared to the operations of a vending (soda) machine. So, the only restriction we need to impose on \(y\) is that \(y \ge 0\). The square root of something is never negative, so at least we need that \(y \ge 0\).Īlso, by applying square to both sides, we get \(x+1 = y^2\), so then the solution is \(x = y^2-1\). So this is a bit trickier: you need to find if you need to restrict \(y\) in any way so that \(f(x) = y\) has a solution for \(x\).Ĭalculate the domain and range of the function \(\displaystyle f(x) = \frac = y\). The value \(y\) is in the range if \(f(x) = y\) can be solved for \(x\). Let \(y\) be a number and we will solve for \(x\) the following equation \(f(x) = y\).

FIND DOMAIN AND RANGE CALCULATOR HOW TO

How to compute the Range, in practical terms?

And the domain will be the rest of the points, this is, all the points excluding those you find that cause undefined operations. So, you need to find those points (if any) where those undefined operations occur. The sources of undefined operations are division by zero or squared root of a negative numbers. How to compute the Domain, in practical terms?įor the domain, you need to find first the points where the function is NOT defined. A more graphical interpretation is this: A point \(b\) is in the range of \(f\) if the horizontal line \(y = b\) intersects the graph of the function \(f(x)\). Then, the range is important because it tells us to what values are reached by the function. It is crucial to know the domain of a function because that gives us a safe set of values on which the function is well defined. Often, the range of a function is written as \(R(f)\) or also as \(f(D)\) (which is also known as the image set of \(D\) through the function \(f\)). More specifically, let \(f: D \rightarrow R\) be a function, the range is the set of all possible values \(b \in R\) for which there exists \(a \in D\) such that \(f(a) = b\). The range of a function, on the other hand, is a set of values that can be reached via the function. Mathematically you will write \(dom(f) = D\).

The domain of the function \(f\) is the set \(D\). More specifically, let \(f: D \rightarrow R\) be a function, which means that \(f(a)\) is well defined for \(a \in D\). The domain of a function is a set where a function is well defined.