Question

Разложите на множители.
a) a²-9y²
b) 25x²-10xy+y
c) 4a-by+ay-4b

Answer 1

$a^2-9y^2=(a-3y)(a+3y)$

$25x^2-10xy+y=5x(5x-2y)+y \ 25x^2-10xy+y^2=(5x-y)(5x-y)=(5x-y)^2$

$4a-by+ay-4b=4(a-b)+y(a-b)=(y+4)(a-b)$

Answer 2

спасибо

Answer 3

$1) a^{2} -9y^{2} =(a-3y)(a+3y) \ 2)25 x^{2} -10xy+y=5x(5x-2y)+y \ 3)4a-by+ay-4b=4a-4b+ay-by=4(a-b)+y(a-b)= \ =(a-b)(4+y)$