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Doss [256]
3 years ago
11

ILL MARK BRAINLIST , pls help n

Mathematics
1 answer:
bearhunter [10]3 years ago
5 0

Answer:

33

Step-by-step explanation:

{x}^{2}  - 5x  -  2 = 0 \\  \\ equating \: it \: with \\ a {x}^{2}  + bx + c = 0 \\ we \: find :  \\ a = 1 \\ b = -  5 \\ c =  - 2 \\  \\  {b}^{2}  - 4ac \\  =  {( - 5)}^{2}  - 4 \times 1( - 2) \\    = 25 + 8 \\   = 33 \\  \\ by \: quadratic \: formula \\  \\ x =  \frac{ - b \pm \sqrt{ {b}^{2} -4ac }   }{2a}  \\  \\ x =  \frac{ - ( - 5) \pm \sqrt{33}}{2 \times 1}  \\  \\ x =  \frac{ 5 \pm \sqrt{33}}{2}...(1)  \\  \\x =  \frac{ 5 \pm \sqrt{n}}{2}...(2)  (given)\\  \\ equating \: equations \: (1) \: and \: (2) \\  \\  \huge \red{ \boxed{n = 33}}

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