Excel VBA: How to Insert formula into an area of cells?

Question

Problem

I need to insert some formulas into a 2 dimensional area of cells with VBA. For example below

Answer 1

Range("yourrange").Formula = "=Sum(whatever)"

where yourrange is a Named Range, or for an actual reference

Range("A1:F8").Formula = "=Sum(whatever)"

Answer 2

range("A1:G10").formula = "=Sum(H1:H10)"

Fill in your own range/formula