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minako444
@minako444
July 2022
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kotarishka
1.
а) (3а+4)^2 = 9а^2+24a+16
б) (2x-b)^2 = 4x^2-4xb+b^2
в) (c+3)(c-3) = c^2-9
г) (5y-2x)(5y+2x) = 25y^2-4x^2
2.
(c+b)(c-b) - (5c^2-b^2) = c^2 - b^2 - 5c^2 +b^2 = - 4 c^2
3.
a) 25y^2-a^2 = (5y-a)(5y+a)
б) 25x^2-10xy+y^2 = (5x-y)^2
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Answers & Comments
а) (3а+4)^2 = 9а^2+24a+16
б) (2x-b)^2 = 4x^2-4xb+b^2
в) (c+3)(c-3) = c^2-9
г) (5y-2x)(5y+2x) = 25y^2-4x^2
2.
(c+b)(c-b) - (5c^2-b^2) = c^2 - b^2 - 5c^2 +b^2 = - 4 c^2
3.
a) 25y^2-a^2 = (5y-a)(5y+a)
б) 25x^2-10xy+y^2 = (5x-y)^2