diff --git a/src/calculator.py b/src/calculator.py
index 4995fb6..0a379ea 100644
--- a/src/calculator.py
+++ b/src/calculator.py
@@ -105,6 +105,13 @@ def power(base: float, exponent: float) -> float:
         >>> power(5, 0)
         1
     """
+    
+    if base < 0 and exponent != 0:
+        inv_exp = 1 / exponent
+        if abs(inv_exp - round(inv_exp)) < 1e-10:
+            if round(inv_exp) % 2 == 0:
+                raise ValueError("Raíz negativa")
+
     return base ** exponent
 
 def valor_maximo(a: float, b: float) -> float:
diff --git a/src/gui.py b/src/gui.py
index 26b6c6c..308502d 100644
--- a/src/gui.py
+++ b/src/gui.py
@@ -331,6 +331,7 @@ def operation_click(self, operation):
             >>> # Con paréntesis: (2+3)*4
             >>> # expression = "(2+3)*4"
         """
+        # Si estamos en modo expresión (con paréntesis)
         if self.use_expression_mode:
             self.expression += operation
             self.display.delete(0, tk.END)
@@ -462,9 +463,13 @@ def equals_click(self):
                 self.first_number = None
                 self.operator = None
                 
-            except ValueError:
-                self.show_error("Entrada inválida")
+            except ValueError as e:
+                if str(e) == "Raíz negativa":
+                    self.show_error("Raíz negativa")
+                else:
+                    self.show_error("Entrada inválida")
                 return
+            
             except ZeroDivisionError:
                 self.show_error("No se puede dividir por 0")
                 return
diff --git a/tests/test_calculator.py b/tests/test_calculator.py
index 3ced422..636d34b 100644
--- a/tests/test_calculator.py
+++ b/tests/test_calculator.py
@@ -53,7 +53,8 @@ def test_power():
     assert power(-2, 3) == -8
     assert power(-2, 0) == 1
     assert power(-2, -3) == -0.125
-    # assert power(-4, 0.5) == -2.0, "Error: la raíz cuadrada de un número negativo no es real"
+    with pytest.raises(ValueError, match="Raíz negativa"):
+        power(-4, 0.5)
 
 
 def test_valor_maximo():