subract it vertically in algebra
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Answer:
19x²-7xy+4y²
Step-by-step explanation:
-12x²-xy+3y² from 7x²-8xy+7y²
7x²-8xy+7y²-(-12x²-xy+3y²)
=7x²-8xy+7y²+12x²+xy-3y²
=19x²-7xy+4y²
Hope it is clear...
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