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(x^2 + 3x - 17)
a = 1, b = 3, c = -17
Dit :
nilai x ?
Jawab :
Dapat diselesaikan dengan persamaan kuadrat.
x1,2 = -b ± √(b^2 - 4ac) / 2a
x1,2 = -3 ± √(3^2 - 4(1 . -17) / 2 . 1
x1,2 = -3 ± √(9 - 4(-17)) / 2
x1,2 = -3 ± √9+68 / 2
x1,2 = -3 ± √77 / 2
Jadi,
x1 = -3 + √77 / 2
x2 = -3 - √77 / 2