Question

-9x= -x² - 14 passo a passo ​

Answer 1

Explicação passo-a-passo:

$- 9x = - {x}^{2} - 14 \\ {x}^{2} - 9x + 14 = 0 \\ \\ d = delta \\ \\ d = {b}^{2} - 4ac \\ d = {( - 9)}^{2} - 4 \times 1 \times 14 \\ d = 81 - 56 \\ d = 25 \\ \\ x = \frac{ - b \frac{ + }{ - } \sqrt{d} }{2a} \\ \\ x = \frac{ - ( - 9) \frac{ + }{ - } \sqrt{25} }{2 \times 1} \\ \\ x = \frac{9 \frac{ + }{ - } 5}{2} \\ \\ {x}^{1} = \frac{9 + 5}{2} = \frac{14}{2} = 7 \\ \\ {x}^{2} = \frac{9 - 5}{2} = \frac{4}{2} = 2$