-25p2-10p+10
Factor -5 out of -25p2.
-5(5p2)-10p+10
Factor -5 out of -10p.
-5(5p2)-5(2p)+10
Factor -5 out of 10.
-5(5p2)-5(2p)-5(-2)
Factor -5 out of -5(5p2)-5(2p).
-5(5p2+2p)-5(-2)
Factor -5 out of -5(5p2+2p)-5(-2).
-5(5p2+2p-2)
Factor -25p^2-10p+10