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x1 + x2 = -q/2
x1 . x2 = c/a = (q-1)/2
x1² + x2² = 4
(x1 + x2)² - 2x1x2 = 4
masukkan nilai masing2
(-q/2)² - 2.(q-1)/2 = 4
q²/4 - q + 1 = 4
q² - 4q + 4 = 16
q² - 4q - 12 = 0
(q - 6) (q + 2) = 0
q = 6
q = -2