To solve the quadratic function shown above, you can factor it, as following:
x^2-10x+25=0
(x-5)(x-5)=0
Then, you can rewrite the expression (x-5)(x-5)=0 as
(x-5)^2=0
When you solve it, you obtain that the value of the variable x is:
x=5
Therefore, the answer is: x=5