Respuesta :

Determinant = b² - 4ac = (-10)² + 4*1*25 = 100 - 100 = 0

So it has 1 solution.
Answer is D
ghanami
Hello here is a solution :
x²-10x+25 = 0
x² -2(x)(5)+5² =0
puy identity  : a²-2ab+b² = (a-b)²
(x-5)² = 0
x-5 = 0
the solution is : 5