Question

square of 3 times of a number is 36.what are the numbers​

Answer 1

There's multiple answers. I'll assume you only mean whole numbers and the order doesn't matter.

1, 1 and 36,

1, 2 and 18,

1, 3 and 12,

1, 4 and 9,

…

You see, you can take every number that 36 is divisible by, put 1 in there, and tadaa! Magic done.

But more interesting are the combinations without 1.

2, 2 and 9,

2, 3 and 6.

These are all that contain 2, excluding the one that contains 1. Starting to see an algorithm? I chose 2 to be fix now, and iterated the second number, so the third will hand itself to me.

You can solve that by sheer brute force now. I don't know about any ways that are more intelligent, though.

EDIT: Thanks to the commenters who pointed out mistakes. I'm usually writing on mobile with german autocorrect, which causes many mistakes.