Add p²-7pq - q² arrel -3p²-2pq+7 q²
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(p²-7pq - q² )+(-3p²-2pq+7 q²)
p²-7pq - q²-3p²-2pq+7 q² (Bracket solving)
p²-3p²-7pq-2pq - q²+7 q² (Arranging the like terms and solving them)
= -2p² - 9pq + 8q²
Here is your answer!!
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