Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
14
x
−
9
=
0
x
=
0.616
or
-14.6
Question 2:
x
2
+
13
x
+
7
=
0
x
=
-0.563
or
-12.4
Question 3:
x
2
+
5
x
+
3
=
0
x
=
-0.697
or
-4.3
Question 4:
3
x
2
−
11
x
−
5
=
0
x
=
4.08
or
-0.409
Question 5:
3
x
2
+
13
x
+
7
=
0
x
=
-0.63
or
-3.7
Question 6:
2
x
2
−
4
x
−
4
=
0
x
=
2.73
or
-0.732
