Question

dau coronita si inima va rog ajuta-ti ma ​

Answer 1

Răspuns:

D={-3;6}
F={1/4; 7/4}

Explicație pas cu pas:

Când sub radical exista o diferența la pătrat , de sub radical iese in modul .

d) |2x-3|=9 =>

2x-3=9 => 2x=12 => x=6

2x-3= -9 =>2x= -6 => x=-3

D={-3;6}
f) |x-1|=3/4

x-1=3/4 => x=3/4+1 => x=7/4

x-1= -3/4 => x=-3/4+1 => x=1/4

F={1/4; 7/4}

Multă bafta!

Answer 2

d)√(2x-3)²=9

±(2x-3)=9

+(2x-3)=9

2x=12

x1=6

-(2x-3)=9

2x-3=-9

2x=-6

x2=-3

D={-3;6}

f)√(x-1)²=3/4

±(x-1)=3/4

+(x-1)=3/4

x=1+3/4=>x1=7/4

-(x-1)=3/4

x-1=-3/4

x=1-3/4=>x2=1/4

F={1/4;7/4}