Question

I think of a number, square it, then subtract the original number. The result is 30. What could the number be

Answer 1

Answer:

$\sqrt{x - x = 30 \\ 6 \times 6 - 6 = 30 \\ } 36 - 6 = 30 \\ 30 = 30 \\ 6$

6 is the answer