himpunan penyelesaian dr no 7

Bab Nilai Mutlak
Matematika SMA Kelas X

| 4 - (2/5) x | - 7 = 13
| 4 - (2/5) x | = 13 + 7
| 4 - (2/5) x | = 20

4 - (2/5) x = 20
- (2/5) x = 20 - 4
x = 16 . (-5/2)
x = -40

4 - (2/5) x = -20
- (2/5) x = -20 - 4
x = -24 . (-5/2)
x = 60

HP = { -40, 60 }

jawabannya D

Nilai Mutlak

|4 (-2/5)x| - 7 = 13
|4 (-2/5)x| = 13 + 7
|4 (-2/5)x| = 20

» |4 (-2/5)x| = 20

4 (-2/5)x = 20
(-2/5)x = 20 - 4
(-2/5)x = 16
x = 16 : (-2/5)
x = 16 × (-5/2)
x = -80/2 = -40

» |4 (-2/5)x| = -20

4 (-2/5)x = -20
(-2/5)x = -20 - 4
(-2/5)x = -24
x = -24 : (-2/5)
x = -24 × (-5/2)
x = 120/2 = 60

HP = {x| -40 , 60}

Jadi, Jawabannya E. (-40 , 60)

Semoga membantu ;)