Question

11-|7-x|=-2
Si a doua problema
13-|2x+5|=-2

Answer 1

Răspuns:

a)S={-6,20}

b)S={-10,5}

Explicație pas cu pas:

a)11-|7-x|=-2

-|7-x|=-2-11

scadem nr

-|7-x|=-13

7-x=13 => -x=13-7=-6

7-x=-13 => -x=-13-7=20

Deci S={-6,-20}

b)13-|2x+5|=-2

-|2x+5|=-2-13

scadem nr

-|2x+5|=-15

2x+5=15 => 2x=15-5 ; 2x=10 ; x=5

2x+5=-15 => 2x=-15-5 ; 2x=-20 ; x=-10

Deci S={-10,5}

Answer 2

Explicație pas cu pas:

11-|7-x|=-2

|7-x|=13

7-x=13

7-x=-13

x=-6

x=20

S={-6;20}

____________

13-|2x+5|=-2

|2x+5|=15

2x+5=15

2x+5=-15

x=5

x=-10

S={5;-10}