Question

3 × ( 2x - 1 ) ^2 = 48

Answer 1

3 x (2x-1)²=48

=> (2x-1)²=48:3

=>(2x-1)²=16

Mà: 4²=16 ; (-4)²=16

=> (2x-1)² =4² hoặc (2x-1)²= (-4)²

=> 2x-1=4 hoặc 2x-1= -4

=> x= 2,5 hoặc x= -2,5

Answer 2

3 x ( 2x - 1 )² = 48

=> ( 2x - 1 )² = 48 : 3

=> ( 2x - 1 )² = 16

=> ( 2x - 1 )² = 4²

=> 2x - 1 = 4 hoặc 2x - 1 = -4

+) 2x - 1 = 4

=> 2x = 5

=> x = 5/2

+) 2x - 1 = -4

=> 2x = -3

=> x = -3/2

Vậy x = 5/2 hoặc x = -3/2

Answer 3

3 x ( 2x - 1 )2 = 48

=> ( 2x - 1 )2 = 48 : 3

=> ( 2x - 1 )2 = 16

Ta thấy: 16 = 42

=> ( 2x - 1 )2 = 42

=> 2x - 1 = 4

=> 2x = 4 + 1

=> 2x = 5

=> x = 5 : 2

=> x = 2,5