# NCERT Class 12-Mathematics: Chapter –9 Differential Equations Part 8

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**Question 17:**

Find the general solution of the differential equation

**Answer:**

**Question 18:**

Find the general solution of .

**Answer:**

Given, differential equation is

Dividing both sides by

Which is a homogeneous differential equation

On substituting these value in Eq. (i), we get

On integrating both sides, we get

**Question 19:**

Solve: *.*[**Hint:** Substitute after separating and

**Answer:**

**Question 20:**

Solve:

**Answer:**

**Question 21:**

Solve the differential equation *dx* given that when

**Answer:**

**Question 22:**

Form the differential equation by eliminating A and B in .

**Answer:**

**Question 23:**

Solve the differential equation .

**Answer:**

**Question 24:**

Find the differential equation of system of concentric circles with centre .

**Answer:**

On differentiating Eq. (i) , we get