3. What must be subtracted from 9a2 - 17ab - 3ba - 10 to get 7a2 + 18ab-9b²a + 15?
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Step-by-step explanation:
9a2 - 17ab - 3b^2a - 10 -( 7a2 + 18ab-9b²a + 15)
9a2 - 17ab - 3b^2a - 10 -7a2 - 18ab+9b²a - 15
2a^2 +6b^2a -35ab -25
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