Hey there!
In order to simplify this, we must use our rules of exponents. We know that we can multiply the six and the three, but we must use our rules to multiply the x^2 and x. Our exponent rule is:
x^y * x^z = x^y+z
Using this rule, we can break this expression into two parts since they're multiplied- the x terms and the non-x terms. We have:
(6)(3)(x^2)(x)
Using our rules of exponents, we can dd the exponents (the x has an invisible "1" exponent), we have:
(6)(3)(x^3) =
18(x^3) =
18x^3
Hope this helps!