hide quick launch leftpanel

if you want to hide Quick Launch  only on single site page then add a content editor webpart and paste the below script



<style type="text/css">
/*--Hide Quick Launch --*/
#s4-leftpanel {
 display: none;
}
.s4-ca {
 margin-left: 0px;
}
</style>


or you want to hide complete Quick Launch from left side then paste in site master page