Question 765710

{{{(r-5)^6}}}

={{{(r-5)(r-5)(r-5)(r-5)(r-5)(r-5)}}}...multiply

={{{(r^2-10r+25)(r^2-10r+25)(r^2-10r+25)}}}

={{{(r^4-20r^3+150r^2-500r+625)(r^2-10r+25)}}}

={{{r^6-30r^5+375r^4-2500r^3+9375r^2-18750r+15625}}}