Question

25r^2+10r+1

Answer 1

25r^2+10r+1
(5r+1) (5r+1)

Answer 2

\[r_{1,2}=\frac{-10\pm\sqrt{10^2-4\cdot25\cdot1}}{2\cdot25}\]

Answer 3

if 25r^2+10r+1 = 0
so r = -1/5