Multiply :
12a + 5b by 7a - b
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(12a + 5b) x (7a - b)
= 12a x 7a - 12a x b + 5b x 7a - 5b x b
= 84a(1+1) - 12ab + 35ab - 5b(1+1)
= 84a2 + 23ab - 5b2
Hence, (12a + 5b) x (7a - b) = 84a2 + 23ab - 5b2
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