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Mathematics

Multiply :

12a + 5b by 7a - b

Algebraic Expressions

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Answer

(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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