We are given the following polynomials:
[tex]3x^4,6x^2[/tex]To multiply these polynomials we will multiply the coefficients and we will add the exponents, like this:
[tex](3x^4)(6x^2)=18x^{4+2}=18x^6[/tex]This expression can't be simplified any further. since it's one term this is a monomial