==SUMSQ(number1,[number2],...)
=SUMSQ(1,2)
This returns the square of each number added together. In this example, 1 and 2 are squared, then added together. Therefore, the result is 5.
=SUMSQ(1,2,3)
This also returns the sum of squares of each number. In this example, 1, 2, and 3 are squared, then added together. Therefore, the result is 14.
=SUMSQ({1,2,3})
This is the same as the previous example. However, this example uses curly brackets ({}) to enclose the list of numbers. Therefore, the result is also 14.
The SUMSQ function adds the squares of its arguments, which can be numbers, names, arrays, or references. All arguments must contain numbers.