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Factorize completely: 4b2 - ab + (a + 9b)2 - a2.
4b2 - ab + (a + 9b)2 - a2 = 4b2 - ab + (a + 9b)2 - a2
(a + 9b)2 = a2 + 2 x a x 9b + (9b)2
(a + 9b)2 = a2 + 18ab + 81b2
Note: (a + b)2 = a2 + 2 x a x b + b2
4b2 - ab + (a + 9b)2 - a2 = 4b2 - ab + a2 + 18ab + 81b2 - a2
4b2 - ab + (a + 9b)2 - a2 = 85b2 + 17ab
4b2 - ab + (a + 9b)2 - a2 = 17b(5b + a)
