2x-8
if it means
2 times -8 then 2 times -8=2 time s8 times -1=16 times -16
if it is x is a placeholder then undistribute where
ab+ac=a(b+c)
so
2x-8
2(x)-2(4)=2(x-4)
so the factored form is 2(x-4)
there is no equation so we cannot solve for x
2x-8 could be equal to 3 or pi for all we know
