Answer:
9
Explanation:
To begin, move the 5x to the other side, leaving a zero in its place. That leaves you with x^2-5x-36=0.
Next, find the factors of 36. Some include, 6 and 6, and 9 and 4.
We are looking for factors of 36 that add to negative 5. That would be 9 and 4, if the 9 was negative.
This leaves you with two binomials, (x-9)(x+4)=0.
Then you put each binomial equal to zero on its own.
x-9=0, x+4=0
when you solve those you get that x= 9,-4
The only positive solution is 9.