# Find {eq}\displaystyle f {/eq} for the following function. {eq}\displaystyle f'(x) = \frac{(x+1)}{\sqrt{x}}, \ f(1) = 5 {/eq}

## Question:

Find {eq}\displaystyle f {/eq} for the following function.

{eq}\displaystyle f'(x) = \frac{(x+1)}{\sqrt{x}}, \ f(1) = 5 {/eq}

## Initial Value Problem:

• When we integrate the derivative of a function, we get back the antiderivative function. This is because integration and differentiation are reverse processes. In an initial value problem, the value of the function at a point is also given. We can use this initial value in the lower limits of integration. The upper limits of integration are to be kept in the variable form.
• We shall be applying the following formulas:

{eq}\begin{align} \hspace{1cm} \int kdx&=kx+C & \left[ \text{Where C is an arbitrary constant of indefinite integration}~ \right] \\[0.3cm] \hspace{1cm} \int x^n\, dx&=\frac { x^{n+1}} {n+1}+C & \left[\text{ This is the power rule of integration } \right]\\[0.3cm] \end{align} {/eq}