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X2 - 5X - 4 = 0

X = - b (+/-) sqrt(b2 - 4ac)/2a

a = 1

b = - 5

c = - 4

X = - ( - 5) (+/-) sqrt[(- 5)2 - 4(1)(- 4)]/2(1)

X = 5 (+/-) sqrt(25 + 16)/2

X = [5 (+/-) sqrt(41)]/2

-------------------------------------exact answer

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Q: What is the quadratic formula of x2-5x-4 equals 0?
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