Løsning af andengradsligninger by https://padlet.com/xkdj1fareh/old76j0sr7dz Løsning af andengradsligninger - mat B en-us 2019-10-14 11:09:40 UTC 2019-10-21 14:14:39 UTC hello@padlet.com https://padlet.net/icons/png/1f58a.png Løsning af andengradsligninger - start her xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397354400 2019-10-14 11:12:14 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397354400 Er ligningen opstillet med "0" på den ene side af lighedstegnet xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397354509 2019-10-14 11:12:43 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397354509 Udfør regneoperationer så der står "0" på den ene side. xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397355580 2019-10-14 11:16:20 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397355580 Er ligningen opskrevet som gangestykker fx 3x(2x-9) = 0 ? xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397356211 2019-10-14 11:18:22 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397356211 Anvend nulreglen. Det vil sige, at hver "lille" gangestykke skal blive "0". Fx 3x=0 og 2x-9=0 xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397356650 2019-10-14 11:19:45 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397356650 Er ligningen på formen a*x^2 = 0 (så både b og c er 0) ? xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397357376 2019-10-14 11:22:34 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397357376 Ligningen har kun en løsning x=0 xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397359277 2019-10-14 11:29:59 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397359277 Er ligningen på formen a*x^2 + b*x +c = 0 xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397360071 2019-10-14 11:31:57 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397360071 Omskriv ligningen, så den er på en anden form som gangestykker eller som ax2+bx+c=0 xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397362144 2019-10-14 11:40:00 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397362144 Er ligningen på formen a*x^2 + c = 0 (så b er 0) ? xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397363504 2019-10-14 11:44:44 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397363504 Er ligningen på formen a*x^2 + b*x = 0 (så c er 0) ? xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397364344 2019-10-14 11:47:37 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397364344 Er ligningen på formen a*x^2 + b*x + c = 0 (så hverken a, b eller c er 0) ? xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397365771 2019-10-14 11:52:25 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397365771 Ligningen har to løsninger kvadratrod af (-c/a) xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397366735 2019-10-14 11:55:52 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397366735 Beregn diskriminanten d=b^2-4*a*c xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397367411 2019-10-14 11:58:31 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397367411 Hvis d<0 er der ingen løsninger xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397367894 2019-10-14 11:59:58 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397367894 Hvis d=0 er der en løsning x = -b/(2a) xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397368064 2019-10-14 12:00:39 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397368064 Hvis d>0 er der to løsninger x = (-b plus/minus kvadratrod(d)/(2a) xkdj1fareh https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397368899 2019-10-14 12:03:23 UTC https://padlet.com/xkdj1fareh/old76j0sr7dz/wish/397368899