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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