Why are quadratic polynomials equated with 0?

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Solution

Just consider a
x^2 + 2x +1 =0
and x^2 + 2x +2 =1

Both are same ,
but when equated to zero in first case ,
we just reduce the quadratic to lower level and find (x+1)^2

so it is written to (x+1)^2=0
so it becomes easy to solve that two values are -2 and -2 itself.

so its easy

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