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Question
Simplify:
(3a - 7b + 3)(3a - 7b + 5)
Solution
(3a - 7b + 3)(3a - 7b + 5)
= 3a(3a - 7b + 5) -7b (3a - 7b + 5) + 3(3a - 7b + 5)
= 9a2 - 21ab + 15a - 21ab + 49b2 - 35b + 9a - 21b + 15
= 9a2 - 42ab + 24a + 49b2 - 56b + 15.
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