The expression 4d-4 can be expressed as 4(d-1).
Factors
A factor is a number that is the product of another number and its own which gives us the desired number.
For example, 4 is a factor of 24, therefore when 4 is multiplied by 6 it gives us the number 24.
In the expression given, (4d-4), we can see that the common factor between both the term is 4. Thus taking 4 as the common factor from expression. we get,
(4d-4)
=4(d-1)
Hence, the expression 4d-4 can be expressed as 4(d-1).
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