Incorrect. In a binary search tree, all the values in the left subtree must be less than the parent$$s key value and all values in the right subtree must be greater than the parent$$s key value. Thus, all the values in the left subtree of x must be less than $8,$ so there cannot be a node with key value $17$ in the left subtree of x$.$ If a node with key value $17$ exists in this tree, it must be in the right subtree of x since $17$ is greater than $8,$ but there is no guarantee of its existence in the tree.