Question

a) x² + 6x +8=0
b) 9x²+6x-48=0
c) x² - 14 X +50=0​

Answer 1

Explicação passo-a-passo:

∆=b²-4ac

∆=6²-4.1.8

∆=36-32

∆=4

$x = \frac{ - b + \sqrt{o} }{2a}$

$x = \frac{ - 6 + \sqrt{4} }{2 \times 1 } \\ x = \frac{ - 6 + 2}{2} \\ x = \frac{ - 4}{2} \\ x = - 2 \\ x = \frac{ - 6 - 2}{2} \\ x = \frac{ - 8}{2} \\ x = - 4$