Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
15
x
−
5
=
0
x
=
0.326
or
-15.3
Question 2:
x
2
+
14
x
+
8
=
0
x
=
-0.597
or
-13.4
Question 3:
x
2
+
7
x
−
3
=
0
x
=
0.405
or
-7.41
Question 4:
2
x
2
−
13
x
+
4
=
0
x
=
6.18
or
0.324
Question 5:
3
x
2
+
10
x
+
2
=
0
x
=
-0.214
or
-3.12
Question 6:
3
x
2
−
6
x
+
2
=
0
x
=
1.58
or
0.423
