Question

Simplify 3r (r - 10s) - 4r (7s + 2r)

Answer 1

3r (r - 10s) - 4r (7s + 2r)

expand by using distributive property

3r^2 - 30rs - 28rs - 8r^2

combine like terms

-5r^2 - 58rs

Answer

-5r^2 - 58rs

Answer 2

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!