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Розклади на множники вираз. a) x2 – 16 = (x – 4)(x + 4); б) x2 – 9y4 = (x – 3y2)(x + 3y2); в) x2 – 6x + 9 = (x – 3)2 = (x – 3)(x – 3); г) a3 – 4a = a(a2 – 4) = a(a – 2)(a + 2); ґ) 3a2 – 6ab + 3b2 = 3(a2 – 2ab + b2) = 3(a – b)2 = 3(a – b)(a – b); д) 2x + 2y – ax – ay = 2(x + y) – a(x + y) = (x + y)(2 – a).