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wyliczamy delte
Δ=b²-4ac
Δ=16²-4*64
Δ=256-256
Δ=0
Xo=16/2=8
(x-8)²=0
x=8
a = 1
b = -16
c = 64
Δ = b² - 4ac
Δ = (-16)² - 4 × 64
Δ = 256 - 256
Δ = 0
x = -b : 2a
x = 16 : 2
x = 8
spr.:
8² - 16 × 8 + 64 = 0
64 - 128 + 64 = 0
0 = 0