Question

resolva a equacao cx-1,2=10

Answer 1

$Cx-1,2=10$

$\frac{(x-1)!}{2!(x-1-2)!} =10$

$\frac{(x-1)!}{2!(x-3)!} =10$

$\frac{(x-1).(x-2).(x-3)!}{2!(x-3)} =10$

$\frac{(x-1).(x-2)}{2} =10$

$(x-1).(x-2)=20$

$x^{2} -3x-18=0$
$Raizes:x` = 6$   e   $x`` =-3$    $resposta$