Розкладіть на множники:
а) c² – b² + c – b;
б) х + у + х² – у²;
в) а² + 4,8ab – x² – 4,8xb.
а) c² – b² + c – b;
б) х + у + х² – у²;
в) а² + 4,8ab – x² – 4,8xb.
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Answers & Comments
б) x+y + x^2 - y^2 = x + y + (x-y)(x+y) = (x-y+1)(x+y)
в) a^2 + 4,8ab - x^2 - 4,8xb = a^2 + 2*a*(2,4b) + (2,4b)^2 - (2,4)b^2 - x^2 - 2*x*(2,4b) = (a + 2,4b)^2 - (x + 2,4b)^2 = (a + x + 4,8b)(a - x)