Question

How to use the distributive property to expand "mx(ab-b)"?  

Answer 1

U multiply (ab-b) by mx,dats it

Answer 2

$mx\cdot(ab-b)=mx\cdot ab+mx\cdot(-b)=abmx-bmx\\\\\\\\\\mx\cdot(ab-b)=mx\cdot b\cdot(a-1)=bmx(a-1)$