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Question
Evaluate: (a + 5)(3a - 2)(5a + 1)
Sum
Solution
(a + 5)(3a - 2)(5a + 1)
= {a (3a - 2) + 5(3a - 2)} (5a + 1)
= (3a2 - 2a + 15a - 10)(5a + 1)
= (3a2 + 13a - 10)(5a + 1)
= 5a (3a2 + 13a - 10) + 1 (3a2 + 13a - 10)
= 15a3 + 65a2 - 50a + 3a2 + 13a - 10
= 15a3 + 68a2 - 37a - 10
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