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x1+x2 = -b/a dan x1. x2 = c/a
x² - (5x1+5x2)x + 5x1.5x2 = 0
x² - 5(x1+x2)x + 25x1.x2 = 0
x² - 5(8/2)x + 25(-3/2) = 0
x² - 20x - 75/2 = 0 dikali 2
2x² - 40x - 75 = 0