HI!
Multiply the 3r to r and -10s
3r^2 - 30rs - 4r(7s+2r)
now multiply -4r to 7s and 2r
3r^2 - 30rs - 28rs - 8r^2
Now combine like terms
3-8 = -5
-30 - 28 = -58
-5r^2 - 58rs
Hope this helps!
3r (r - 10s) - 4r (7s + 2r)
expand by using distributive property
combine like terms
Answer
