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Solution 2.1:1c
From Förberedande kurs i matematik 1
The factor −x2 can be written as (−1)x2 and both factors can be multiplied into the bracket
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| −x2(4−y2)=(−1)x2(4−y2)=(−1)x2 4−(−1)x2y2=−4x2+x2y2. |
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