Solve quadratic equation x²-8x-1=0 by formula method

Mathematics

2 answers:

Alex_Xolod [135]2 years ago

6 0

Answer:

x²-8x-1=0

comparing above equation with ax²+bx+c=0

a=1

b=-8

c=-1

$x = \frac{ - b + - \sqrt{ {b}^{2} - 4ac } }{2a}$

=(--8+-√(64-4×1×-1)/2×1

=8+-√(64+4)/2

taking positive

x=(8+√68)/2=2(4+√17)/2=4+√17

taking negative

x=(8-√68)/2=2(4-√17)/2=4-√17

Ad libitum [116K]2 years ago

3 0

maybe be it's right.....

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