Suppose we have an equation

3x + 2 = 8

But, what is the value of x?

Let’s try

**
For x = 0
**

3 × 0 + 2 = 8

0 + 2 = 8

2 = 8

It is not true

So, equation is not satisfied for x = 0

3x + 2 = 8

**
For x = 1
**

3 × 1 + 2 = 8

3 + 2 = 8

5 = 8

It is not true

So, equation is not satisfied for x = 1

**
For x = 2
**

3 × 2 + 2 = 8

6 + 2 = 8

8 = 8

It is true

So, equation is satisfied for x = 2

So, we say that

x = 2 is a solution of the equation

Here, we have found the solution

by trying different values of x

And checking

So, this method is known as finding solution of equation by trial & error.