Answer :
The distributive propperty states that if a number is multiplying an operation held inside parenthesis, this is equal as that same number multiplying each one of the terms in the parenthesis:
[tex]a(b+c)=ab+ac[/tex]Considering this you can solve the expression by multiplying 4 to each term of the subtraction inside the parenthesis:
[tex]4(3x-2)=(4\cdot3x)-(4\cdot2)=12x-8[/tex]