Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
+
9
x
−
3
=
0
x
=
0.322
or
-9.32
Question 2:
x
2
−
6
x
−
8
=
0
x
=
7.12
or
-1.12
Question 3:
x
2
−
10
x
−
10
=
0
x
=
10.9
or
-0.916
Question 4:
2
x
2
−
12
x
+
2
=
0
x
=
5.83
or
0.172
Question 5:
2
x
2
+
11
x
−
10
=
0
x
=
0.794
or
-6.29
Question 6:
3
x
2
−
10
x
−
7
=
0
x
=
3.93
or
-0.594
