Answer :
Let X be the positive number.
From the given condition, we get X = X^2–56
=> X^2-X-56=0
Factorizing the above equation,
=> X^2–8X+7X-56=0
X(X-8)+7(X-8)=0
(X-8)(X+7)=0
X=8 or -7
Since it is said the number is positive. Our output number will be 7
From the given condition, we get X = X^2–56
=> X^2-X-56=0
Factorizing the above equation,
=> X^2–8X+7X-56=0
X(X-8)+7(X-8)=0
(X-8)(X+7)=0
X=8 or -7
Since it is said the number is positive. Our output number will be 7