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(x - 5) *(x + 5) = 0
x - 5= 0 v x+5=0
x = 5 x= -5
Δ = b^2 - 4ac = 0 - 4(1 * (-25)) = 0 - 4 (-25) = 100
√Δ = 10
x1 = (-b - √Δ)/2a = (0 - 10)/2 = -10/2 = -5
x2 = (-b + √Δ)/2a = (0 + 10)/2 = 10/2 = 5