The value of x in the surd expression is 147
How to solve surds
Surds are expressions that involves square roots of a particular number or more and these number are not a perfect square.
In this expression, the first step is to solve the parameters on the left-hand side. By doing so, we have:

From the left-hand side, the square root of 42 is 7, so the equation becomes:

Squaring both sides to eliminate the square root:




x = 147
Therefore, the solution to the value of x in the surd expression is 147.