Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
9
x
−
8
=
0
x
=
0.815
or
-9.82
Question 2:
x
2
+
10
x
+
1
=
0
x
=
-0.101
or
-9.9
Question 3:
x
2
+
10
x
+
8
=
0
x
=
-0.877
or
-9.12
Question 4:
3
x
2
+
9
x
+
6
=
0
x
=
-1
or
-2
Question 5:
3
x
2
−
15
x
+
5
=
0
x
=
4.64
or
0.359
Question 6:
3
x
2
+
14
x
−
1
=
0
x
=
0.0704
or
-4.74
