Answer
$$-35x^{11}$$
Work Step by Step
First, we multiply the coefficients:
$$-35(x^3)(x^8)$$
Next, we use the product rule for exponents, which states that if the bases of two monomials are the same, we can add the exponents and keep the variable:
$$-35(x^{3 + 8})$$
Simplify by adding the exponents:
$$-35x^{11}$$
