Hi everyone, I’m currently trying to graph a piecewise function in Desmos, but I’m not quite sure how to do it. The function I’m working with is f(x) = { 2x + 1 if x ≤ 0, 4x - 3 if x > 0 }. I’ve tried entering it as two separate functions, but that doesn’t seem to work. I also tried using the “piecewise” function in Desmos, but I’m not sure how to properly format it. Can anyone help me with this? Thanks in advance!
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f(x)={x<=0:2x+1, 4x-3}
This can be extended to additional pieces, where you have {condition 1:expression 1, condition 2:expression 2, … , “otherwise” expression}
To graph a piecewise function in Desmos, you can follow these steps.
- Open the Desmos graphing calculator in your web browser
- Define your piecewise function using curly braces and separate each piece with a comma. Each piece should be defined using the
iffunction, which has the syntax:if(condition, value_if_true, value_if_false).
For example, let’s say you have a piecewise function defined as follows:
f(x) = {
2x, if x < 0,
x^2, if 0 <= x <= 2,
sqrt(x - 2) + 2, if x > 2
}
In Desmos, you would write this as:
f(x) = 2x {x < 0} + x^2 {0 <= x <= 2} + sqrt(x - 2) + 2 {x > 2}
After that, enter the piecewise function in the expression input field in Desmos then Press the “Enter” key or click the “+” button to graph the function.
Desmos will then plot the graph of your piecewise function based on the conditions and values specified.
This method doesn’t work for me, which is likely because pieces of this are undefined so no sum can be determined. @Daniel_Wekselgreene gives the correct conditional notation for Desmos, which is:
{condition: value_if_true, value_if_false}
and you can nest them…
{condition: value_if_true, condition2: value_if_true2, value_if_false}
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