Question

a)|2x-7 1= 9 b) 2[3(2x +5 )-4] -4 = 3 c) 212 X+51-15= 3​

Answer 1

Răspuns:

a) I2x-7I=9

2x-7=±9

2x=9+7=>x=16:2=>x=8

2x-7= -9+7=>x=-2:2=>x= -1

_________________

2[3(2x +5 )-4] -4 = 3

2[3(2x +5 )-4] =3+4

3(2x+5)-4=7:2

6x+15=3,5+4

6x=7,5-15

x=-7/5/6=>x=-1,25=>x= (-125/100)⁽²⁵= -5/4

_____________

212x+51-15= 3​

212x+36=3

212x=3-36

x= -33/212