To factor this quadratic equation, we need to find two numbers that multiply to 25 and add up to -10.
The two numbers that fit these criteria are -5 and -5, as -5 * -5 = 25 and -5 + (-5) = -10.
Therefore, we can rewrite the equation as:
(س - 5)^2 = 0
Now we can see that the equation is a perfect square trinomial, since (س - 5)^2 = س^2 - 10س + 25.
So the solution to the equation س^2 - 10س + 25 = 0 is:
س = 5
