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y = 4(x² - 2x + 1)
y = 4(x - 1)²
y = 4(x - 1)(x - 1) - postać iloczynowa trójmianu kwadratowego
stosujemy wzór skróconego mnożenia (a-b)=a²-2ab+b²
czyli
= 4(x-1)²=4(x-1)(x-1)
a=4
b=-8
c=4
Δ=(b)²-4ac
Δ=(-8)²-4×4×4
Δ=64-64=0
x₀=-b/2a
x₀=8/8=1