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What should be taken away from 3x^2-4y^2...

What should be taken away from `3x^2-4y^2+5xy+20` to obtain `-x^2-y^2+6xy+20` ?

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To solve the problem, we need to determine what expression should be subtracted from \(3x^2 - 4y^2 + 5xy + 20\) in order to obtain \(-x^2 - y^2 + 6xy + 20\). ### Step-by-Step Solution: 1. **Set up the equation**: We need to find an expression \(E\) such that: \[ 3x^2 - 4y^2 + 5xy + 20 - E = -x^2 - y^2 + 6xy + 20 ...
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