Question 741201
That shows several numbers combined as factors.  You can use the associative property for multiplication.  The grouping will not change anything.  You can omit, almost entirely in this expression, the grouping symbols.  Next, you have the commutative property for multiplication.


{{{(5r)(-4r^6s^2)(3r^5s^4) =5r*(-4)r^6*s^2*3*r^2*s^4}}}
={{{(-4)(5)(3)*r*r^6*r^2*s^2*s^4=highlight(-60*r^9*s^6)}}}, which just finishes with rules of exponents.