Answer
$81x^4+108x^3+54x^2+12x+1$
Work Step by Step
Use the binomial theorem formula (detailed on page 754) to solve the problem. Be careful in writing each term correctly.
$(3x+1)^4$
$1*(3x)^4+4*(3x)^3*(1)+6*(3x)^2*(1)^2+4*(3x)*(1)^3+(1)^4$
$81x^4+108x^3+54x^2+12x+1$
