$12 x^{2} + 84 x - 441 = 0$
$r o o t s = ?$

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Solution

$12 x^{2} + 84 x - 441 = 0$

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

$x = \frac{- 84 + \sqrt{84^{2} - 4 \cdot 12 (- 441)}}{2 \cdot 12} : \frac{7}{2}$

$x = \frac{- 84 - \sqrt{84^{2} - 4 \cdot 12 (- 441)}}{2 \cdot 12} : - \frac{21}{2}$

$x = \frac{7}{2}, x = - \frac{21}{2}$

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