Question

a friend decides that 4(x+3)=4x+3. explaine to your freind that 4(x+3)= 4x+12

Answer 1

It would be 4(x+3) = 4x+12 because you are multiplying each number in the parenthesis by the outside number. Which is 4.
4 * x = 4 
4 * 3 = 12