Question

calcule h)
$\frac{5 - \sqrt{ {5}^{2} - 4 \times 1 \times 4} }{2}$

Answer 1

$\frac{5 - \sqrt{ {5}^{2} - 4 \times 1 \times 4} }{2} = \\ = \frac{5 - \sqrt{25 - 16} }{2} \\ = \frac{5 - \sqrt{9} }{2} \\ = \frac{5 - 3}{2} \\ = \frac{2}{2} \\ = 1$

Answer 2

$\frac{5 - \sqrt{ {5}^{2} - 4 \cdot 1 \cdot 4} }{2} \\ = \frac{5 - \sqrt{ 25 - 16} }{2} \\ = \frac{5 - \sqrt{ 9} }{2} \\ = \frac{5 -3}{2} \\ = \frac{ \cancel{2} }{ \cancel{2} } \\ = 1$