Use the Quadratic Formula to Solve with Surds.
Question 1:
x
2
+
11
x
−
8
=
0
x
=
-11
±
3
17
2
Question 2:
x
2
+
12
x
−
4
=
0
x
=
-6
±
2
10
Question 3:
x
2
+
2
x
−
8
=
0
x
=
2
or
-4
Question 4:
x
2
+
7
x
−
8
=
0
x
=
1
or
-8
Question 5:
x
2
−
10
x
+
9
=
0
x
=
9
or
1
Question 6:
x
2
−
9
x
−
9
=
0
x
=
9
±
3
13
2
