Question

Разложите на множители
a) 25x^3y^2 - 4xy^4
b) 45 - 30a + 5a^2

Answer 1

1) 25x^3*y^2 - 4xy^4 = xy^2*(25x^2 - 4y^2) = xy^2*(5x - 2y)(5x + 2y)
2) 5a^2 - 30a + 45 = 5(a^2 - 6a + 9) = 5(a - 3)(a - 3)