diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..f4ad89d
Binary files /dev/null and b/.DS_Store differ
diff --git a/README.md b/README.md
index 73ee1a7..9c845cf 100644
--- a/README.md
+++ b/README.md
@@ -56,3 +56,31 @@ df = @(x) -(2*(x)^2-4*x+1)*exp(-(x-1)^2);
 | 4 |  1.2 |    2.3315e-13 |
 | 5 |  1.2 |    2.3315e-13 |
 ```
+
+
+Question 4
+a)
+```matlab
+lj = @(x) 4*0.039*((2.394./x).^12-(2.394./x).^6);
+[x,E,ea,its] = goldmin(lj,2.8,6)
+```
+x =
+
+    2.8000
+
+
+E =
+
+   -0.0371
+
+
+ea =
+
+   9.9392e-05
+
+
+its =
+
+    27
+
+    
diff --git a/goldmin_lj.m b/goldmin_lj.m
new file mode 100644
index 0000000..914d579
--- /dev/null
+++ b/goldmin_lj.m
@@ -0,0 +1,2 @@
+lj = @(x) 4*0.039*((2.394./x).^12-(2.394./x).^6);
+[x,E,ea,its] = goldmin(lj,0,3)
\ No newline at end of file