Derivative of
The derivative of is .
f(x) =
Type any function of x; the derivative is computed symbolically in your browser.
How to work it out
- 1
We differentiate with respect to x. The rule that applies is the chain rule.
- 2
Chain rule: differentiate the outer function, keep the inside, then multiply by the derivative of the inside. The inside is .
- 3
The outer function is sqrt(u); its derivative evaluated at g(x), times g'(x):
- 4
Simplify:
- 5
Differentiating once more gives the second derivative, which tells you about curvature:
LaTeX source of the formulas on this page
\[ \frac{d}{dx}\left[\sqrt{2 x}\right] = \frac{2}{2 \sqrt{2 x}} \]
\[ f(x) = \sqrt{2 x} \]
\[ g(x) = 2 x,\quad g'(x) = 2 \]
\[ f'(x) = \left[\frac{1}{2 \sqrt{u}}\right]_{u=g(x)} \cdot g'(x) \]
\[ f'(x) = \frac{2}{2 \sqrt{2 x}} \]
\[ f''(x) = \frac{-\left(4 \frac{2}{2 \sqrt{2 x}}\right)}{\left(2 \sqrt{2 x}\right)^{2}} \]Values of f and f' for sqrt(2x)
| x | f(x) | f'(x) |
|---|---|---|
| 0.5 | 1 | 1 |
| 1 | 1.4142136 | 0.70710678 |
| 2 | 2 | 0.5 |
| 3 | 2.4494897 | 0.40824829 |
Questions
What is the derivative of sqrt(2x)?
The derivative of is .
What is the second derivative of sqrt(2x)?
-(4 * 2 / (2sqrt(2x))) / (2sqrt(2x))^2.
Which rule do you use for sqrt(2x)?
The chain rule.
What is the slope of sqrt(2x) at x = 1?
0.70710678.