а) (х-7)^2 = x^2 - 14x + 49б) (3у-4)^2 = 9y^2 - 24y + 16в) (а+2)(а-2) = a^2 - 4г) (3х-у)(3х+у) = 9x^2 - у^2а) а^2-14а+49 = (а-7)^2б) 4х^2+4ху+у^2 = (2x + y)^2в) к^2-а^2 = (k + a)(k - a)г) 36х^2-49у^2 = (6x + 7y)(6x - 7y)д) а^3-8 = (a - 2)(a^2 + 2a + 4)е) 27р^2+8с^3 = (3p + 2c)(9p^2 - 6pc + 4c^2)а) 3х(3х+7)-(3х+1)^2 = 9x^2 + 21x - (9x^2 + 6x + 1) = 9x^2 + 21x - 9x^2 - 6x - 1 = 15x - 1б) (у-4)^2-(4-у)(4+у) = y^2 - 8y + 16 - (16 - y^2) = y^2 - 8y + 16 - 16 + y^2 = 2y^2 - 8y
а) (х-7)^2 = x^2 - 14x + 49
б) (3у-4)^2 = 9y^2 - 24y + 16
в) (а+2)(а-2) = a^2 - 4
г) (3х-у)(3х+у) = 9x^2 - у^2
а) а^2-14а+49 = (а-7)^2
б) 4х^2+4ху+у^2 = (2x + y)^2
в) к^2-а^2 = (k + a)(k - a)
г) 36х^2-49у^2 = (6x + 7y)(6x - 7y)
д) а^3-8 = (a - 2)(a^2 + 2a + 4)
е) 27р^2+8с^3 = (3p + 2c)(9p^2 - 6pc + 4c^2)
а) 3х(3х+7)-(3х+1)^2 = 9x^2 + 21x - (9x^2 + 6x + 1) = 9x^2 + 21x - 9x^2 - 6x - 1 = 15x - 1
б) (у-4)^2-(4-у)(4+у) = y^2 - 8y + 16 - (16 - y^2) = y^2 - 8y + 16 - 16 + y^2 = 2y^2 - 8y