f(x) = x2 – 4x + 4
= (x – 2)2
= [g(x)]2 ………….. [g(x) = (x – 2) is a linear polynomial]
Zero of g(x) is 2,
Zeroes of f(x) are 2 and 2.
So we can say that zeroes of f(x) are coincident.
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