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Verify Commutativty of Addition of Rational Numbers for Each of the Following Pairs of Rotional Numbers: − 4 and 4 − 7 - Mathematics

Sum

Verify commutativty of addition of rational numbers for each of the following pairs of rotional numbers: 

\[- 4\ \text{and} \frac{4}{- 7}\]
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Solution

\[\text{We have - 4 and} \frac{4}{- 7} . \]
\[ \therefore \frac{- 4}{1} + \frac{- 4}{7} = \frac{- 4 \times 7}{1 \times 7} + \frac{- 4}{7} = \frac{- 28 - 4}{7} = \frac{- 32}{7}\]
\[ \frac{- 4}{7} + \frac{- 4}{1} = \frac{- 4}{7} + \frac{- 4 \times 7}{1 \times 7} = \frac{- 4 - 28}{7} = \frac{- 32}{7}\]
\[ \therefore - 4 + \frac{4}{- 7} = \frac{4}{- 7} - 4\]
\[ \text{Hence verified} . \]

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APPEARS IN

RD Sharma Class 8 Maths
Chapter 1 Rational Numbers
Exercise 1.2 | Q 1.6 | Page 14
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