Вот решение,надеюсь помог:)
(y-4)^2= y^2 - 2*y*4 +4^2=y^2-8y+16
(7x+a)^2=(7x)^2 + 2*7x*a + a^2=49x^2+14ax+a^2
(5c-1)(5c+a)=(5c)^2 - 1^2=25c^2-1
(3a+2b)(3a-2b)=(3a)^2 - (2b)^2= 9a^2-4b^2
(a-9)^2-(81+2a)=a^2 - 2*a*9 + 9^2 - 81-2a=a^2-18a+81-81-2a=a^2-20a
x^2-49=x^2-7^2=(x-7)(x+7)
25x^2-10xy+y^2=(5x)^2 - 2*5x*y + y^2=(5x-y)^2
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Answers & Comments
Вот решение,надеюсь помог:)
(y-4)^2= y^2 - 2*y*4 +4^2=y^2-8y+16
(7x+a)^2=(7x)^2 + 2*7x*a + a^2=49x^2+14ax+a^2
(5c-1)(5c+a)=(5c)^2 - 1^2=25c^2-1
(3a+2b)(3a-2b)=(3a)^2 - (2b)^2= 9a^2-4b^2
(a-9)^2-(81+2a)=a^2 - 2*a*9 + 9^2 - 81-2a=a^2-18a+81-81-2a=a^2-20a
x^2-49=x^2-7^2=(x-7)(x+7)
25x^2-10xy+y^2=(5x)^2 - 2*5x*y + y^2=(5x-y)^2