Question

r(5r+r squared)

Answer 1

Distribute: \(r(5r+r^2) = 5r^2 + r^3\)

Answer 2

Then add to get \[6r ^{2}\]

Answer 3

It is \(\Large 5r^2 + r^3\) and so you have to leave it like that.
I made the font larger so it is clearer now.

Answer 4

Oh wow sorry. xD
I read the first post as r(5r + r)