Answer:
1. a²+10a+25
2.9x²y²-42xy+49
3.(x+y-2)²
4.4x²+9y²+25+12xy+20x+30y
5.9a²+b²+4c²-cab+12ac-4bc
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Answers & Comments
Answer:
1. a²+10a+25
2.9x²y²-42xy+49
3.(x+y-2)²
4.4x²+9y²+25+12xy+20x+30y
5.9a²+b²+4c²-cab+12ac-4bc