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Solution 2.1:1c

From Förberedande kurs i matematik 1

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The factor <math> -x^2 </math> can be written as <math>(-1)x^2 </math> and both factors can be multiplied into the bracket:
The factor <math> -x^2 </math> can be written as <math>(-1)x^2 </math> and both factors can be multiplied into the bracket:

Revision as of 06:32, 21 August 2008

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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