569/MR00. zadatak / Matematika - Zbirka rešenih zadataka

MR-569 / 569. zadatak

Rešiti jednačinu:

$x^{2} - 2 x - 35 = 0$

$x^{2} - 2 x - 35 = 0$

$a = 1; b = - 2; c = - 35;$

$x_{1, 2} = \frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$

$x_{1, 2} = \frac{- (- 2) \pm \sqrt{{(- 2)}^{2} - 4 \cdot 1 \cdot (- 35)}}{2 \cdot 1}$

$= \frac{2 \pm \sqrt{4 + 140}}{2}$

$= \frac{2 \pm \sqrt{144}}{2}$

$= \frac{2 \pm 12}{2}$

$x_{1} = \frac{2 + 12}{2}$

$x_{1} = \frac{14}{2}$

$x_{1} = 7$

$x_{2} = \frac{2 - 12}{2}$

$x_{2} = \frac{- 10}{2}$

$x_{2} = - 5$

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