(4a - 3b +5) (4a - 3b+7)
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Step-by-step explanation:
(4a - 3b +5) (4a - 3b+7) = (4a×4a)+(4a×-3b)+(4a×7)+(-3b×4a)+(-3b×-3b)+(-3b×7)+
(5×4a)+(5×-3b)+(5×7)
= 16a²-12ab+28a-12ab+9b²-21b+20a-15b+35
= 16a²+9b²-24ab+48a-36b+35
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