Four times a number is equal to it’s square. What is the number?

Answer 1

You can use trial and error, but think about numbers.

4x=x^2

4(2)=2^2

8=4 so 2 is not the answer.

Think about what times 4 would be the same as squaring a number. 4 squared IS 4x4

4(4)=4^2

16=16

So the answer is 4