How do you subtract 5b2−2a2 from 4a2−8ab−9b2?
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(4a2-8ab-9b2)-(5b2-2a2)
=4a2-8ab-9b2-5b2+2a2
=4a2+2a2-8ab-9b2-5b2
=6a2-8ab-14b2
=4a2-8ab-9b2-5b2+2a2
=4a2+2a2-8ab-9b2-5b2
=6a2-8ab-14b2
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