Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
5
x
−
9
=
0
x
=
1.41
or
-6.41
Question 2:
x
2
+
11
x
−
5
=
0
x
=
0.437
or
-11.4
Question 3:
x
2
−
14
x
+
2
=
0
x
=
13.9
or
0.144
Question 4:
4
x
2
−
14
x
−
3
=
0
x
=
3.7
or
-0.203
Question 5:
5
x
2
−
6
x
−
8
=
0
x
=
2
or
-0.8
Question 6:
3
x
2
−
13
x
−
2
=
0
x
=
4.48
or
-0.149
