Question

Punctul C va rog multtt dau coroană!

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

c)|x+3|+|2x+6|+|3x+9|+|4x+12|+|5x+15|=90

|x+3|+|2(x+3)|+|3(x+3)|+|4(x+3)|+|5(x+3)|=90

|x+3|+|2|•|x+3|+|3|•|x+3|+|4|•|x+3|+|5|•|x+3|=90

|x+3|+2•|x+3|+3•|x+3|+4•|x+3|+5•|x+3|=90

1•|x+3|+2•|x+3|+3•|x+3|+4•|x+3|+5•|x+3|=90

(1+2+3+4+5)•|x+3|=90

(6+9)•|x+3|=90

15•|x+3|=90

15•|x+3|:15=90:15

|x+3|=6

x+3=6

x+3-3=6-3

x=6-3

x=3

x+3=-6

x+3-3=-6-3

x=-6-3

x=-(6+3)

x=-9

S={3,-9}