Odpowiedzi

2010-04-11T18:58:31+02:00
2010-04-11T18:59:24+02:00
W(x)= 25x²- 20x-4
W (x) = (5x - 2)²
2010-04-11T19:04:21+02:00
W(x)=25x²-20x-4
W(x)=(5x-(-2))²
25x²-20x-4=0
Δ=b²-4ac
Δ=(-20)²-4×25×(-4)
Δ=400+200
Δ=600
√Δ=√100×6=10√6

x₁=20-10√6÷50
x₁=⅖-10√6

x₂=20+10√6÷50
x₂=⅖+10√6