Answer:
x = 3 units
Explanation:
Given that,
length of the square = a = √(x+6)
area of the square = 3x
We know that, the formula to find the area of a square is:
Area = a²
3x = (√(x+6))²
3x = x + 6
Subtract x from both sides.
3x - x = 6
2x = 6
Divide both sides by 2.
x = 3