⇒ f '(x) = {4x ; x ≠ 0
⇒ f ' (x) < 0 for x < 0 and f ' (x) > 0 for x > 0 and f '(0^{−}) = 3, = f '(0^{+}) and f(0) = 4
⇒ f(x) has a removable discontinuity at x = 0
Also
⇒ There is no extreme however g.l.b of f(x) = 3
f(2^{-}) = 3; f(2^{+}) = 1
∴ f(x) is discontinuous at x = 2
⇒ f(x) increase for x ∈(0, 2) and f(x) decrease ...
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