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Solution 2.1:1f

From Förberedande kurs i matematik 1

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The squaring rule (a+b)2=a2+2ab+b2 with a=5 and b=4y gives

(5+4y)2=52+254y+(4y)2=25+104y+42y2=25+40y+16y2=16y2+40y+25.
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