Start by FOILing: First, Outer, Inner, Last.
3x•x= 3x^2; 3x•2= 6x; 2•x= 2x; 2•2= 4
Put it all together
3x^2 + 6x + 2x + 4
Combine like terms to get your answer
3x^2 + 8x + 4
