Expand the product — task. Mathematics State Board, Class 8.

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{(4 a + 7 b)}^{2}

\(=\)

{i a}^{2} + i b^{2} + i a b

{(8 a - 5 b)}^{2}

\(=\)

i a^{2} + i b^{2} + i a b

[Note: Insert the answer with sign if there is any negative sign]

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1. Expand the product