Question

(5y-1)^2 com conta pf

Answer 1

25y^2 -2(5y)(-1) + 1
25y^2 + 10y + 1

Delta = 100 - 4(25)(1)
Delta = 100 - 100
Delta = 0

X1 = X2 = (-10 + 0)/2.(25)
X1 = X2 = -10/50 = -1/5