Question

Quanto é k²-8k+9=0 Me Ajude PorFavor

Answer 1

k² - 8k + 9 = 0

$\displaystyle \mathsf{\Delta = {(8)}^{2} - 4.1.9} \\ \displaystyle \mathsf{\Delta = 64 - 36 } \\ \displaystyle \mathsf{\Delta = 28}$

$\displaystyle \mathsf{ k = \frac{8 \pm \: 2\sqrt{7} }{2}} \\ \displaystyle \mathsf{k = 4 \pm \: \sqrt{7} }$