(a) p² - 9pq - q² and 4p² - 5pq + 2q²
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=> p² - 9pq - q² + 4p² - 5pq + 2q²
=> p² + 4p² - 9pq - 5pq - q² +2q²
=> 5p² - 14pq +q² ...ans....
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