Expand using the identity — task. Mathematics CBSE, Class 9.

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{(x + 7 y + 49 z)}^{2}

\(=\)

x^{i} + i i^{2} + i z^{2} + i i y + i y i + i x i

[Note: Enter the answer in the order of the identity with its coefficient.]

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3. Expand using the identity