Question

1. Daca x-1/2 = 4 / x+1


Atunci numarul natural x este egal cu …

Answer 1

     
$\frac{x-1}{2}+ \frac{4}{x+1} \\ \\ (x-1)(x+1)=4*2 \\ x^{2} -1=8 \\ x^{2} =9 \\ x= \pm \sqrt{9} = \pm \; 3 \\ x_1 = \boxed{3} \\x_2 = \boxed{-3}$