Question 614854
just solved all of these ... will copy solutions


grouping ___ (-x^2y^2 + 4 y^2) + (x^4 - 4x^2)

factoring ___ -y^2(x^2 - 4) + x^2(x^2 - 4)

rearranging ___ (x^2 - y^2)(x^2 - 4)

factoring (again) ___ (x + y)(x - y)(x + 2)(x - 2) ___ difference of squares, twice



8t(t^2 - 10t + 25)

8t (t - 5)^2 



-3b(k^2 - 3k + 2)

-3b (k - 2) (k - 1)