Question

Tentukan HP dari (2x-3 ) =5

Answer 1

Verified answer

2x - 3 = 5
2x = 5 + 3
2x = 8
  x = 8 : 2
  x = 4

Hp {4}

Jika persamaan Mutlak :

|2x - 3| = 5
2x - 3 = 5
2x = 8
  x = 8 : 2
  x = 4

|2x - 3| = 5
-(2x - 3) = 5
-2x + 3 = 5
-2x = 2
   x = 2 : (-2)
   x = -1

Hp{-1, 4}

Answer 2

Materi : Nilai Mutlak
Kelas : X SMA

Cara I :

I2x - 3 I = 5
2x - 3 = 5 atau -5

2x - 3 = 5
2x = 8
x = 4

2x - 3 = -5
2x = -2
x = -1

Hp = { -1 , 4}

Cara II :

I2x - 3I = 5
(2x - 3)^2 = 5^2
4x^2 - 12x + 9 = 25
4x^2 - 12x + 9 - 25 = 0
4x^2 - 12x - 16 = 0
---------------------------- : 4
x^2 - 3x - 4 = 0
(x - 4) (x + 1) = 0

x - 4 = 0
x = 4

x + 1 = 0
x = -1

Hp = { -1 , 4 }


HASILNYA SAMA !!!