The square root of the product of 4 and a number is 26

Answer 1

Taking the number as x,

Product = 4x
Square root of product = √(4x)
= 2√x
As per the question,

Square root of product = 26
=> 2√x = 26
=> √x = 13
=> x = 13^2 = 169

Answer 2

The square of the product of 4 and a number? Could you please explain how to obtain the answer.