x = 1.6 and x = -0.6
x = -1.6 and x = 0.6
x = 1.6 and x = 0.6
x = -1.6 and x = -0.6
Correct answer is A
x2−x−1=0
Using the quadratic formula,
x=−b±√b2−4ac2a
a = 1, b = -1, c = -1.
x=−(−1)±√(−1)2−4(1)(−1)2(1)
x=1±√1+42=1±√52
x=1+2.242;x=1−2.242
x=3.242;x=−1.242
x=1.62;x=−0.61
x≊
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