error CS1525: Unexpected symbol '

so I was making my first game and I came across this bug

using UnityEngine; using System.Collections;

public class UpgradeManager : MonoBehaviour {

 public Click1 click;
 public UnityEngine.UI.Text itemInfo;
 public float cost;
 public int count = 0;
 public int clickPower;
 public string itemName;
 private float _newCost;

     void Update() {    
     itemInfo.text = itemName + "\nCost: " + cost "\nPower: +" + clickPower; 
 }

 public void PurchaseUpgrade() {
     if (click.wood >= cost) {
         click.wood -= cost;
         count += 1;
         click.woodperclick += clickPower;
         cost = Mathf.Round (cost * 1.15f); 
         _newCost = Mathf.Pow (cost, _newCost = cost); 
     }
 }

}