What do i do when im asked to (factor and expression) like 28-7x
Factor out the largest number. 7 is the largest number that divides into both 28 and 7.
= 7(4 - 1x)
= 7(4 - x)
factor the expression by setting it into primes
14*2-7x
7*2*2-7x
28−7x=7∗4−7∗x=7(4−x)