Question

Utilizind relatiile lui Viete,rezolvati in R ecuatia.F nu trebuie

Answer 1

a)x²-5x+6-0
a=1
b=-5
c=6
x1+x2+x3=-b/a=--5/1=5
x1x2+x1x3+x1x3=c/a⇒6/1=6

b)x²+11x+18=0
a=1
b=11
c=18
x1+x2+x3=-b/a=-11/1=-11
x1x2+x1x3+x2x3=c/a=18/1=18

c)x²+5x-14=0
a=1
b=5
c=-14
x1+x2+x3=-b/a=-5/1=-5
x1x2+x2x3+x1x3=-14/1⇒-14

d)x²-4x-21=0
x1+x2+x3=-b/a=4/1=4
x1x2+x1x3+x2x3=-21/1=-21
e)x²+6x-40⇒
a=1
b=6
c=-40⇒x1+x2+x3=-6/1⇒-6
x1x2+x1x3+x2x3=-40/1=-40
sucees