Question

Am nevoie de ajutor la aceste ecuații

Answer 1

a) 3x(x+9)=0
1. 3x=0
x=0
2. x+9=0
x=-9
b) delta=81-32=49
x1=(-9+7)/2=1
x2=(-9-7)/2=-8
c) delta=25-20=5
x1=(-5+radical5)/2
x2=(-5-radical5)/2
d) delta=81+40=121
x1=(-9+11)/2=1
x2=(-9-11)/2=-10
e) 3x^2+x-4=0
delta=1+48=49
x1=(-1+7)/2=3
x2=(-1-7)/2=-4
f) delta=25-48=-23
x1=(-5+i radical23)/3
x2=(-5- i radical23)/3

Answer 2

Rezolvarea este in atasament.