Subtract 5a² +7ab-2b²+4 from 7a²-ab+2b² .
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The answer is 2a^2-8ab+4b^2
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(7a 2 −ab+2b 2)−(5a 2+7ab−2b 2 +4)
2a 2 −8ab+4b 2−42
(a 2−4ab+2b2 −2)
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