Step 1. Check if both terms of your expression have a common factor.
Notice that both 28x and 4 are divisible by 4, so the common factor of your expression is 4.
Step 2. Take out the common factor by dividing each one of the terms by the common factor and grouping the results inside a parenthesis:
[tex] \frac{28x}{4}=7x [/tex] and [tex] \frac{4}{4} =1[/tex]
[tex]28x-4=4(7x-1)[/tex]
We can conclude that the factored form of [tex]28x-4[/tex] is [tex]4(7x-1)[/tex].
