Odpowiedzi

2009-10-25T16:14:27+01:00
2009-10-25T16:18:53+01:00
X² - 10x + 21 = 0
Δ = 100 - 4 × 21
Δ = 16
√Δ = 4
x₁= (10 + 4) / 2
x₁= 7
x₂= (10 - 4) / 2
x₂= 3
2009-10-25T16:21:10+01:00
Δ=(-10)²-4*1*21
Δ=100-84
Δ=16
√Δ=4