Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
−
5
x
−
8
=
0
x
=
6.27
or
-1.27
Question 2:
x
2
+
13
x
−
10
=
0
x
=
0.728
or
-13.7
Question 3:
x
2
+
11
x
+
2
=
0
x
=
-0.185
or
-10.8
Question 4:
5
x
2
+
9
x
−
10
=
0
x
=
0.776
or
-2.58
Question 5:
3
x
2
−
8
x
+
1
=
0
x
=
2.54
or
0.131
Question 6:
2
x
2
+
4
x
−
3
=
0
x
=
0.581
or
-2.58
