Matematika mohon bantuannya

Nomor 5
bagian d
x² – 2x – 3 = 0
x² – 2x = 3
x² – 2x + (2/2)² = 3 + (2/2)²
x² – 2x + 1 = 3 + 1
(x – 1)² = 4
x – 1 = + 2
x = 1 dan – 3

bagian f
2x² – 3x – 5 = 0
2x² – 3x = 5
bagi dengan 2
x² – 3/2 x = 5/2
x² – 3/2 x + (3/2 : 2)² = 5/2 + (3/2 : 2)²
(x – 3/4)² = 5/2 + 9/16
x – 3/4  =  + 7/4
x = + 7/4 + 3/4
x = 10/4 dan -1

bagian g
3x² + 4x – 7 = 0
3x² + 4x = 7
bagi dengan 3
x² + 4/3 x = 7/3
x² + 4/3 x + (4/3 : 2)² = 7/3 + (4/3 : 2)²
(x + 4/6)² = 7/3 + (4/6)²
(x + 4/6)² = 7/3 + 16/36
(x + 4/6)² = 100/36
x + 4/6  =  + 10/6
x = + 10/6 – 4/6
x = 1 dan – 14/6

bagian i
6x² + x – 1 = 0
6x² + x = 1
bagi dengan 6
x² + 1/6 x = 1/6
x² + 1/6 x + (1/6 : 2)²  =  1/6 + (1/6 : 2)²
(x + 1/12)² = 1/6 + 1/144
(x + 1/12)² = 25/144
x + 1/12 = + 5/12
x = + 5/12 – 1/12
x = 4/12 dan – 6/12

bagian j
2x² – 5x + 2 = 0
2x² – 5x = -2
bagi dengan 2
x² – 5/2 x = – 1
x² – 5/2 x + (5/2 : 2)² = – 1+ (5/2 : 2)²
(x + 5/4)² = – 1 + 25/16
(x + 5/4)² =  9/16
x + 5/4 = + 3/4
x = + 3/4 – 5/4
x = – 2/4 dan -2