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Factorize each of the following expression: a4b4 − 81c4 - Mathematics

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Question

Factorize each of the following expression:
a4b4 − 81c4

Sum
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Solution

\[a^4 b^4 - 81 c^4 \]
\[ = ( a^2 b^2 )^2 - (9 c^2 )^2 \]
\[ = ( a^2 b^2 + 9 c^2 )( a^2 b^2 - 9 c^2 )\]
\[ = ( a^2 b^2 + 9 c^2 )[(ab )^2 - (3c )^2 ]\]
\[ = ( a^2 b^2 + 9 c^2 )(ab + 3c)(ab - 3c)\]

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Chapter 7: Factorization - Exercise 7.5 [Page 17]

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RD Sharma Mathematics [English] Class 8
Chapter 7 Factorization
Exercise 7.5 | Q 43 | Page 17

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