Factor completely. 25x^2 + 40xy + 16y^2
Factor. s^2(t – u) – 9t^2(t – u)
Factor completely. 25x^2 + 40xy + 16y^2
Factor. s^2(t – u) – 9t^2(t – u)
For the top: Hint: a2 + 2ab + b2 = (a+b)2
For the bottom: factor out (t-u) from both terms to get (t-u)(s2 - 9t2). Factor the second set of parentheses. (Hint: Difference of two squares)

Decker C.
Koon W.
Theodore B.