Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
−
5
x
−
5
=
0
x
=
5.85
or
-0.854
Question 2:
x
2
−
3
x
−
9
=
0
x
=
4.85
or
-1.85
Question 3:
x
2
+
9
x
+
4
=
0
x
=
-0.469
or
-8.53
Question 4:
2
x
2
+
15
x
+
2
=
0
x
=
-0.136
or
-7.36
Question 5:
2
x
2
−
13
x
−
10
=
0
x
=
7.19
or
-0.695
Question 6:
5
x
2
−
8
x
−
5
=
0
x
=
2.08
or
-0.481
