(у-4)во второй степени;(7х+а)во второй степени;(5с-1)(5с+1);(3а+2b)(3a-2b)
(y-4)^2=(y+4)(y-4)
(7x+a)^2=(7x+a)(7x-a)
(5c-a)(5c+1)=(5c-a)^2
(3a+2b)(3a-2b)=(3a-2b)^2
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(y-4)^2=(y+4)(y-4)
(7x+a)^2=(7x+a)(7x-a)
(5c-a)(5c+1)=(5c-a)^2
(3a+2b)(3a-2b)=(3a-2b)^2