Hello there! I'd be happy to help you with squaring matrices in Excel.

To square a matrix in Excel, you can use the MMULT function. The MMULT function multiplies two matrices together, so you can use it to multiply a matrix by itself (i.e. square it).

Here's how to do it:

1. First, enter your matrix into Excel. Let's say your matrix is in cells A1:B2.
2. Next, select a range of cells where you want the squared matrix to appear. For example, you could select cells D1:E2.
3. In the first cell of the range (D1), enter the following formula:
   Formula:

   =MMULT(A1:B2,A1:B2) 

4. Press Enter to calculate the formula. The resulting matrix will appear in the selected range (D1:E2).

That's it! You've now squared your matrix in Excel using the MMULT function.

Note that this method will only work for square matrices (i.e. matrices with the same number of rows and columns). If your matrix is not square, you won't be able to square it using this method.

I hope this helps with your math portfolio.