Answer:
⇢

Explanation:
⇢

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From the above equation, expanding we get:-
⇢

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Now combining the like terms:-
⇢

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⇢

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⇢

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Point to remember:-
⇢ In the part of equation expansion, there we have to expand the given equation like: (7² = 7 * 7 = 49). Therefore we get that number.