By multiplying the same numbers.
2*2=4 *4 square root is 2
3*3=9 *9 square root is 3
4*4=16 *16 square root is 4
5*5=25 *25 square root is 5
Try this, maybe it will work :)
In order from left to right:
D, C, A, B
Integers are whole numbers so the answer is -3
The answer would be no solution. It comes out to 56=-49
If Ramon needs the same amount of x as someone else find the missing part in the problem then the amount Ramon need (x) is you answer.