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b. x² + 7x + 6 = 0
Jawab: (x + 6)(x + 1) = 0
x + 6 = 0
x = -6
atau
x + 1 = 0
x = -1
x = -6 atau x = -1
c. –3x² – 5x + 2 = 0
Jawab: dikalikan negatif
3x² + 5x - 2 = 0
(3x + 6)(3x - 1) = 0 ; kurung kiri dibagi 3
(x + 2)(3x - 1) = 0
x + 2 = 0
x = -2
atau
3x - 1 = 0
x = 1/3
x = -2 atau x = 1/3
