## College Algebra (6th Edition)

$10 x^{7} y^{9}$
$(2x^{3}y^{2})(5x^{4}y^{7})$ To multiply monomials, multiply coefficients and add exponents $= 2\times 5 \times x^{3+4}\times y^{2+7}$ $=10 x^{7} y^{9}$