Question

Разложить на множители a) 25y-y^3 ; б) -4х^2 + 8xy- 4y^2

Answer 1

25y-y^3=y(5-y)(5+y)

-4х^2 + 8xy- 4y^2=-4(x^2-2xy+y^2)=-4(x-y)^2

 

Answer 2

$25y - y^{3} = y(25 -y^{2}) = y(5 - y)(5 + y)$

 

$-4x^{2} + 8xy- 4y^{2} = -4(x^{2} - 2xy + y^{2}) = -4(x - y)(x - y)$