a) (2x-1)^2 = 4x^2 - 4x + 1
в) (y-5)(y+5) = y^2 - 25
б) (3a+c)^2 = 9a^2 + 6ac + c^2
г) (4b+5c)(4b-5c) = 16b^2 - 25c^2
a) (2x-1)^2 = 4x^2 - 4x + 1
в) (y-5)(y+5) = y^2 - 25
б) (3a+c)^2 = 9a^2 + 6ac + c^2
г) (4b+5c)(4b-5c) = 16b^2 - 25c^2