subtract 5a^2-7ab+5b^2 from 8a^2 -5ab + 9b^2
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8a²-5ab+9b²-(5a²-7ab+5b²)
8a²-5ab+9b²-5a²+7ab-5b²
8a²-5a²-5ab+7ab+9b²-5b²
3a²+2ab+4b².
Hence the answer will be 3a²+2ab+4b².
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