Question

va rog multt dau coroana ​

Answer 1

Ai răspuns atașat pe foaie.

Answer 2

Răspuns:

1.a)3x²+5x+4=0

∆=25-4×12=24-48=-24

x≠R

b)2x²+7x+5=0

∆=49-40=9>0

x1 =-5/2. x2=-1 x=R

c)9x²-5x-2=0

∆=25+4×18>0

x=R

2.a)2x²+9x+10=0

∆=81-4×29=81-96<0

b)x²-5x+4=0

∆=25-16=9

x1,2=(5±3)/2=>x1=4. x2=1

c)2x²+x√7-7=0

∆=7+56=63

x1=√7/2. x2=-√7

d)-3x²-x+2=0

∆=1+24=25

x1 =-1. x2=2/3

e)x²√10-7x+√10=0

∆=10-40=-30<0 x≠R

f)x²+1/6x-1/6=0

∆=1/36+⁶4/6=(1+24)/36=25/36

x1=-1/2. x2=1/3