Ответ:
(2y+3)^2-49=(2y+3-7)(2y+3+7)=(2y-4)(2y+10)
(3a-b)^2-(a-2b)^2=(3a-b-a+2b)(3a-b+a-2b)=(2a+b)(4a-3b)
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Ответ:
(2y+3)^2-49=(2y+3-7)(2y+3+7)=(2y-4)(2y+10)
(3a-b)^2-(a-2b)^2=(3a-b-a+2b)(3a-b+a-2b)=(2a+b)(4a-3b)