Answer:
[tex] x = \frac{ - ( - 7) + - \sqrt{( - 7) {}^{2} } - 4 \times 1 \times 8}{ 2 \times 1} [/tex]
[tex]x = \frac{7 + - \sqrt {49 - 32} }{ 2} [/tex]
[tex] x = \frac{ 7 + - \sqrt{17} }{2} [/tex]
[tex]x 1= \frac{7 + \sqrt{17} }{2} [/tex]
[tex]x 2= \frac{ 7 - \sqrt{17} }{2} [/tex]
