Resolve into factors
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27) sol: it can be written as -(a²+b²-2ab) +c²+d²+2cd = (c+d)²-(a-b)². ans
28) it can be written as also
4x²-4xy+y² -(4y²-4yz+z²) = (2x-y)²-(2y-z)² ans.
30) it can be written as (b+c)²+(3a²-4ab-2c²)
29) 4a²-4ab+b²-b²-c²-2bc =(2a-b)²-(b+c)² ans.
28) it can be written as also
4x²-4xy+y² -(4y²-4yz+z²) = (2x-y)²-(2y-z)² ans.
30) it can be written as (b+c)²+(3a²-4ab-2c²)
29) 4a²-4ab+b²-b²-c²-2bc =(2a-b)²-(b+c)² ans.
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