# Question #95c78

Feb 8, 2017

See explanation

#### Explanation:

The forward difference quotient

$\frac{\Delta f}{\Delta x}$

$= \frac{f \left(x + h\right) - f \left(x\right)}{h}$. This simplifies to

$- 6 x - 1 - 3 h \to f ' = - 6 x - 1$, as $\Delta x = h \to 0$.

The answer quoted by you is also incorrect.