## How do you tell if a function is continuous from a graph?

A function is continuous when its graph is a single unbroken curve …

…

that you could draw without lifting your pen from the paper..

## How do you know if a function is continuous?

How to Determine Whether a Function Is Continuousf(c) must be defined. The function must exist at an x value (c), which means you can’t have a hole in the function (such as a 0 in the denominator).The limit of the function as x approaches the value c must exist. … The function’s value at c and the limit as x approaches c must be the same.

## How do you know if a function is continuous on an interval?

A function is said to be continuous on an interval when the function is defined at every point on that interval and undergoes no interruptions, jumps, or breaks. If some function f(x) satisfies these criteria from x=a to x=b, for example, we say that f(x) is continuous on the interval [a, b].

## How do you know if a function is discontinuous?

Start by factoring the numerator and denominator of the function. A point of discontinuity occurs when a number is both a zero of the numerator and denominator. Since is a zero for both the numerator and denominator, there is a point of discontinuity there. To find the value, plug in into the final simplified equation.

## Is a function differentiable if it is continuous?

In particular, any differentiable function must be continuous at every point in its domain. The converse does not hold: a continuous function need not be differentiable. For example, a function with a bend, cusp, or vertical tangent may be continuous, but fails to be differentiable at the location of the anomaly.