Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
5
x
−
8
=
0
x
=
1.27
or
-6.27
Question 2:
x
2
+
6
x
+
4
=
0
x
=
-0.764
or
-5.24
Question 3:
x
2
−
10
x
−
4
=
0
x
=
10.4
or
-0.385
Question 4:
3
x
2
+
2
x
−
8
=
0
x
=
1.33
or
-2
Question 5:
3
x
2
+
10
x
−
8
=
0
x
=
0.667
or
-4
Question 6:
2
x
2
−
9
x
−
10
=
0
x
=
5.42
or
-0.922
