Please I need help on how to replace elements in a matrix with another elements. For example, I have a (5,5) matrix, and I like to replace elements from All rows and column 3 to 5, with zero. such that (All, 3;;5) replace with zero.
m = MatrixForm[Partition[Range[25]^2, 5]]
I like to replace all the elements in the specified area with zero: