. What must be subtracted from the sum of 3x2 – 3y2 + 7 and x2 – y2 to get 7?
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Answer:
4x^2 - 4y^2
Step-by-step explanation:
(3x^2 - 3y^2 + 7 + x^2 - y^2) - 7
= 4x^2 - 4y^2
Therefore, 4x^2 - 4y^2 must subtracted in order to get 7
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