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Multiply: 12a + 5b by 7a − B - Mathematics

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Sum

Multiply: 12a + 5b by 7a − b

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Solution

(12a + 5b) (7a − b) = 12a (7a − b) + 5b (7a − b)

= 84a2 − 12ab + 35ab − 5b

= 84a2 + 23ab − 5b2

Concept: Multiplication of Algebraic Expressions - Multiplying Monomial by Monomials
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 11 Algebraic Expressions
Exercise 11 (C) | Q 1.09 | Page 143
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