SUMSQ function
This article describes the formula syntax and usage of the SUMSQ function in Microsoft Excel.
Description
Returns the sum of the squares of the arguments.
Syntax
SUMSQ(number1, [number2], ...)
The SUMSQ function syntax has the following arguments:

Number1, number2, ... Number1 is required, subsequent numbers are optional. 1 to 255 arguments for which you want the sum of the squares. You can also use a single array or a reference to an array instead of arguments separated by commas.
Remarks

Arguments can either be numbers or names, arrays, or references that contain numbers.

Numbers, logical values, and text representations of numbers that you type directly into the list of arguments are counted.

If an argument is an array or reference, only numbers in that array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are ignored.

Arguments that are error values or text that cannot be translated into numbers cause errors.
Example
Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.
Formula 
Description (Result) 
Result 
=SUMSQ(3, 4) 
Sum of the squares of 3 and 4 (25) 
25 