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⇒(8√7m×√7m+6√10n×√7m+ (8√7m×2√10n + 6√10n×2√10n
⇒8×√49m²+6√70mn+16√70mn+12√100n²
⇒8×7m+22√70mn+12×10n
⇒56m+22√70mn+120n