How do you simplify #-2x^2y^2(3x^2-xy+4y^2)#?
Use distributivity and commutativity of multiplication to get:
Distributivity says that
Commutativity of multiplication says that:
Associativity of multiplication says that:
More generally, we can miss out the brackets and not worry what order multiplication occurs in in a product like:
So for example
Notice that when multiplying powers you add the exponents: