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x2+3x+1 = (x-2)2
we know the expansion of (a-b)2 is a2 - 2ab + b2
so expanding
x2 - 4x + 4
so putting the expansion in the question:
x2+3x+1 = x2 - 4x + 4
x2 gets cancelled.
3x+ 1 = 4x+4
-x -3 = 0
it is not a quadratic equation as it is not in the form of
ax2 + bx+ c = 0
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