ng-show and ng-model are part of angularjs (1.x). In angular 4, you can do the following:
<div> <input type="checkbox" unchecked name="advanced" [(ngModel)]="checked"> <p>Advanced search</p> </div> <p [hidden]="!checked"> advanced-search works! </p>
p.s. the user cleared in his comment on the question that he is using angular4.
4
solved Angular: ng-model and ng-show not working