a=1 b=2
[tex]a = 1 \\ b = 2 \\ c = - 35[/tex]
[tex] \frac{ - b \pm \sqrt{{b}^{2} - 4ac} }{2a} [/tex]
[tex] \frac{ - 2 \pm \sqrt{4 - 4(1)( - 35)} }{2} [/tex]
[tex] \frac{ - 2 \pm \sqrt{144} }{2} = \frac{ - 2 \pm12}{2} = 5 \: or \: - 7[/tex]
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