Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
13
x
+
6
=
0
x
=
-0.479
or
-12.5
Question 2:
x
2
−
5
x
+
4
=
0
x
=
4
or
1
Question 3:
x
2
−
4
x
−
7
=
0
x
=
5.32
or
-1.32
Question 4:
5
x
2
−
8
x
−
1
=
0
x
=
1.72
or
-0.117
Question 5:
3
x
2
+
6
x
−
4
=
0
x
=
0.528
or
-2.53
Question 6:
5
x
2
+
11
x
−
2
=
0
x
=
0.169
or
-2.37
