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a = 1, b = -2, c = -5
Sehingga
D = b² - 4ac
= (-2)² - 4(1)(-5)
= 4 + 20
= 24
Sehingga
√D = √24
√D = √4 · √6
√D = 2√6
maka
x1 = (-b + √D)/(2a)
= (-(-2) + 2√6)/(2(1))
= (2 + 2√6)/2
= 1 + √6
dan
x2 = (-b - √D)/(2a)
= (-(-2) - 2√6)/(2(1))
= (2 - 2√6)/2
= 1 - √6
Terimakasih semoga membantu