Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
9
x
+
10
=
0
x
=
-1.3
or
-7.7
Question 2:
x
2
−
12
x
+
7
=
0
x
=
11.4
or
0.615
Question 3:
x
2
−
3
x
−
8
=
0
x
=
4.7
or
-1.7
Question 4:
3
x
2
+
14
x
−
4
=
0
x
=
0.27
or
-4.94
Question 5:
5
x
2
−
15
x
+
4
=
0
x
=
2.7
or
0.296
Question 6:
3
x
2
−
4
x
+
1
=
0
x
=
1
or
0.333
