Question

doar b,c,d. va rog mult ajutați-mă ​

Answer 1

Răspuns:

Explicație pas cu pas:

b)

-1 < (4x + 6)/2 < 9

-2 < 4x + 6 < 18

-8 < 4x < 12

-2 < x < 3

A = (-2, 3)

_____

-7 < (6x + 10)/2 < 11

-14 < 6x + 10 < 22

-24 < 6x < 12

-4 < x < 2

B = (-4, 2)

__________

A = (-2, 3) si B = (-4, 2)

A U B = (-4, 3)

A ∩ B = (-2, 2)

c)

-9 < (5x + 12)/2 < 16

-18 < 5x + 12 < 32

-30 < 5x < 20

-6 < x < 4

A = (-6, 4)

____

-8 < (7x + 12)/2 ≤ 27

-16 < 7x + 12 ≤ 54

-28 < 7x ≤ 42

-4 < x ≤ 6

B = (-4, 6]

__________

A = (-6, 4) si B = (-4, 6]

A U B = (-6, 6]

A ∩ B = (-4, 4)