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express as perfect square x⁴+2x³+3x²-2x+1
Asked by mobarakhussain70993 | 29 Aug, 2021, 08:41: AM
Let , x4 + 2 x3 + 3 x2 + 2 x + 1 = ( x2 + a x + b )2

RHS = x4 + a2 x2 + b2 + 2a x3 + (2ab) x + 2b x2

If we compare the expanded RHS and LHS , we get ,

2a = 2 , i.e a = 1

2ab = 2 ,  hence if a =1 , b = 1

Hence , we get , x4 + 2 x3 + 3 x2 + 2 x + 1 = ( x2 + x +1 )2

To get a perfect square of given polynomial , coefficient of x term should be +2 not -2 .
Hence the coefficient of x term is changed .
If we do not change it is not possible to express the given polynomial as perfect square
Answered by Thiyagarajan K | 17 Sep, 2021, 01:47: PM

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