Use the Quadratic Formula to Solve to 3 s.f.
Question 1:
x
2
−
3
x
−
5
=
0
x
=
4.19
or
-1.19
Question 2:
x
2
−
3
x
−
9
=
0
x
=
4.85
or
-1.85
Question 3:
x
2
+
12
x
−
8
=
0
x
=
0.633
or
-12.6
Question 4:
5
x
2
+
x
−
8
=
0
x
=
1.17
or
-1.37
Question 5:
4
x
2
−
12
x
−
10
=
0
x
=
3.68
or
-0.679
Question 6:
2
x
2
+
6
x
−
7
=
0
x
=
0.898
or
-3.9
