Răspunsuri

2014-03-27T18:07:53+02:00
2-9x+18=0
2-9x=0-18
2-9x=-18
9x=-18-2
9x=-20⇒x=-20:9=-2,(2)
1 5 1
2014-03-27T18:32:05+02:00

Ai ecuatie de gradul 2, dar nu s-a inteles. Am scis X la puterea 2 ca fiind X*X)

X*X-9X+18=0    Δ=9*9-4*18=81-4*18=81-72=9             

X1=(9+√9)/2=(9+3)2=6

X2=(9-√9)/2=(9-3)/2=3