*What should be added to (3x²y + 4xy² − 8xy), so that the value of the expression at x = 2 and y = −1 becomes −9?* 1️⃣ −21
2️⃣ 11
3️⃣ 3
4️⃣ −45
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*What should be added to (3x²y + 4xy² − 8xy), so that the value of the expression at x = 2 and y = −1 becomes −9?* 1️⃣ −21
2️⃣ 11
3️⃣ 3
4️⃣ −45
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