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Discuss the continuity of the functions at the points given against them. If a function is discontinuous, determine whether the discontiunity is removable. In this case, redefine the function, so that it becomes continuous : `{:(f(x)=(x^(2)-4x)/(sqrt(x^(2)+9)-5)",","for" x ne4),(=3",", "for"x=4):}}at x =4.`

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The correct Answer is:
`f(4)=240`
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