Question

Срочно нужно решить!

Answer 1

Ответ:

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

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

Answer 2

$\displaystyle 1)25y-y^3=y(25-y^2)=y(5-y)(5+y)\\\\2)-4x^2+8xy-4y^2=-4(x^2-2xy+y^2)=-4(x-y)^2$