Factor out the greatest common factor

simply the factor if possible.
26(5-x)2-5(5-x)3

26(5-x)^2 - 5(5-x)^3

= (5-x)^2 (26 - 5(5-x))
= (5-x)^2 (26 - 25 + 5x)
= (5-x)^2 (5x+1)