Question 695705
{{{-7r^6s^5(-r^6s^4-5r^3s^4)}}}


{{{((-7r^6s^5)*(-r^6s^4))-((-7r^6s^5)*(5r^3s^4))}}}


multiply the co-efficients and add the exponents of like variables
The product of two negatives is positive.


{{{7r^12s^9+35r^9s^9}}}