Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
13
x
+
5
=
0
x
=
-0.397
or
-12.6
Question 2:
x
2
−
4
x
−
9
=
0
x
=
5.61
or
-1.61
Question 3:
x
2
+
10
x
+
8
=
0
x
=
-0.877
or
-9.12
Question 4:
5
x
2
+
11
x
−
6
=
0
x
=
0.452
or
-2.65
Question 5:
2
x
2
−
11
x
−
1
=
0
x
=
5.59
or
-0.0895
Question 6:
5
x
2
+
10
x
−
5
=
0
x
=
0.414
or
-2.41
