Solving Quadratics by Factorising
Question 1:
x
2
−
5
x
−
6
=
0
x
=
-1
or
x
=
6
Question 2:
x
2
+
4
x
−
21
=
0
x
=
-7
or
x
=
3
Question 3:
x
2
+
2
x
−
80
=
0
x
=
8
or
x
=
-10
Question 4:
x
2
+
7
x
−
8
=
0
x
=
1
or
x
=
-8
Question 5:
x
2
−
5
x
−
6
=
0
x
=
6
or
x
=
-1
Question 6:
x
2
−
2
x
−
15
=
0
x
=
5
or
x
=
-3
