400-20t=t^{2}obliczyć t.
400-20t=t^2
t^2 +20t -400 =0
delta = 400 + 1600 = 2000
pierw z delty = 5*pierw z 80
t1 = (-20 - 5pierwiastków z 80)/2
t2 = (-20 + 5pierwiastków z 80)/2
czy to na pewno jest t do kwadratu ?
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400-20t=t^2
t^2 +20t -400 =0
delta = 400 + 1600 = 2000
pierw z delty = 5*pierw z 80
t1 = (-20 - 5pierwiastków z 80)/2
t2 = (-20 + 5pierwiastków z 80)/2
czy to na pewno jest t do kwadratu ?