Question

sendo x= -b + √b² - 4 ac, calcule o valor de x para: a=1, b=5, c=6
$x = - b + \sqrt{b {}^{2} } - 4 \: ac \:$
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Answer 1

$- b + \sqrt{ {b}^{2} - 4ac } \\ = - 5 + \sqrt{ {5}^{2} - 4.1.6 } \\ = - 5 + \sqrt{25 - 24} = - 5 + \sqrt{1} \\ = - 5 + 1 = - 4$