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Solution 2.1:1c

From Förberedande kurs i matematik 1

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The factor −x2 can be written as (−1)x2 and both factors can be multiplied into the bracket

−x2(4−y2)=(−1)x2(4−y2)=(−1)x24−(−1)x2y2=−4x2+x2y2.
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