# how to write a function equation

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A function is an equation that has only one answer for y for every x. A function assigns exactly one output to each input of a specified type. If you are trying to find the zeros for the function (that is find x when f(x) = 0), then that is simply done using quadratic equation - no need for math software. It is an equation for the parabola shown higher up. Plugging in r=-6 into the equation gives x 2 +y 2 =36, which describes the graph of a circle with radius 6. This is the formula for a cirlce, so we can eliminate the two "line" answers. 1. Now we can extend what we know about graphing linear functions to analyze graphs a little more closely. If the built-in equations don’t meet the actual needs, you could edit or modify them by equation tools or even write math equation by using handwriting board, especially those with complex symbols and structures. After completing this lesson, you will also be able to evaluate profit functions and use them in real life scenarios. Determining the equation of a logarithmic function from data There are many computer packages (SPSS, Excel, etc) that can determine a "best fit" curve for a given set of data. Definition of a Function Before we show the profit function equation… But for the sake of explaining how to determine an unknown logarithmic function from its data plot, let's take a look at this example (one which is close to my heart). How to: Given a function in equation form, write its algebraic formula. This is the final equation in the article: f(x) = 0.25x^2 + x + 2. It is common to name a function either f(x) or g(x) instead of y. f(2) means that we should find the value of our function when x equals 2. Tip 1: Insert Math Equation. Recall that in Linear Functions, we wrote the equation for a linear function from a graph. The polar equation formula here is x 2 +y 2 =r 2.. Explanation: . Write the equation for a linear function from the graph of a line. Go to Insert tab, find Symbols group and click Equation button. This lesson will tell you how to write and use a special type of function called a profit function. Solve the equation to isolate the output variable on one side of the equal sign, with the other side as an expression that involves only the input variable. Begin by taking a look at Figure 8. Which "x" are you trying to calculate?