Use the Quadratic Formula to Solve with Surds.
Question 1:
x
2
−
8
x
−
9
=
0
x
=
9
or
-1
Question 2:
x
2
−
14
x
−
2
=
0
x
=
7
±
51
Question 3:
x
2
+
6
x
+
7
=
0
x
=
-3
±
2
Question 4:
x
2
+
4
x
−
6
=
0
x
=
-2
±
10
Question 5:
x
2
−
9
x
−
9
=
0
x
=
9
±
3
13
2
Question 6:
x
2
−
12
x
−
1
=
0
x
=
6
±
37