First, enter data in an excel table.

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Select the data, click Insert in the Functions tab, and then select a line chart in the chart.

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Click the drop-down arrow of the line chart and select all chart types.

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Among all open chart types, select one as needed, and then click OK to display Figure 2 below.

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Select a point in the chart, right-click, and then click Add Trend Line.

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In the trend line option menu, select the required curve type and check the small box in front of the lowest display formula (and the box showing R).

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The final curve with formula is shown in the following figure.