Răspuns:
Explicație pas cu pas:
Folosim relatiile Viete:
x1+x2=-b/a si x1x2=c/a
a) b=1+3=4 c=3·1=3
x²-4x+3=0
b) b=5-4=1 c=-20
x²-x-20=0
c) b=-1-2=-3 c=2
x²+3x+2=0
d) b=1/2+3/4=5/4 c=1/2·3/4=3/8
x²-5/4x+3/8=0
8x²-10x+3=0
e) b=3-3=0 c=-9
x²-9=0
f) b=5/2+7/2=12/2=6 c=5/2·7/2=35/4
x²-6x+35/4=0
4x²-24x+35=0
g) b=2-√3+2+√3=4 c=(2-√3)(2+√3)=4-3=1
x²-4x+1=0
h) b=-1-√2-1+√2=-2 c=(-1-√2)(-1+√2)=1-2=-1
x²-2x-1=0