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Multiply: (0.8a − 0.5b) by (1.5a − 3b) - Mathematics

Answer in Brief

Multiply:
(0.8a − 0.5b) by (1.5a − 3b)

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Solution

To multiply, we will use distributive law as follows:

\[\left( 0 . 8a - 0 . 5b \right)\left( 1 . 5a - 3b \right)\]

\[ = 0 . 8a\left( 1 . 5a - 3b \right) - 0 . 5b\left( 1 . 5a - 3b \right)\]

\[ = 1 . 2 a^2 - 2 . 4ab - 0 . 75ab + 1 . 5 b^2 \]

\[ = 1 . 2 a^2 - 3 . 15ab + 1 . 5 b^2 \]

Thus, the answer is  \[1 . 2 a^2 - 3 . 15ab + 1 . 5 b^2\].

Concept: Multiplication of Algebraic Expressions
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APPEARS IN

RD Sharma Class 8 Maths
Chapter 6 Algebraic Expressions and Identities
Exercise 6.5 | Q 10 | Page 31
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