Practicing Success
The function $f(x)=\left\{\begin{matrix} \frac{x^2+2x-3}{x-1} & ,x≠1\\2 & ,x=1 \end{matrix}\right.$ is : |
continuous at x = 1 discontinuous at x = 1 continuous at every real number discontinuous at every real number |
discontinuous at x = 1 |
The correct answer is Option (2) → discontinuous at x = 1 $f(1)=2$ $\lim\limits_{x→1}f(x)=\lim\limits_{x→1}\frac{x^2+2x-3}{x-1}$ $=\lim\limits_{x→1}\frac{x^2+3x-x-3}{x-1}$ $=\lim\limits_{x→1}\frac{(x+3)(x-1)}{x-1}$ $=\lim\limits_{x→1}(x+3)=4≠f(1)$ discontinuous at $x=1$ |