## Precalculus (6th Edition) Blitzer

$30x^{11}y^{12}$
Start with given expression: $(-5x^{4}y)(-6x^{7}y^{11})$ Group factors with the same bases: $(-5\times-6)(x^{4}x^{7})(yy^{11})$ Simplify using multiplication rules: $30x^{11}y^{12}$