Solving Quadratics by Factorising
Question 1:
x
2
+
12
x
+
27
=
0
x
=
-3
or
x
=
-9
Question 2:
x
2
+
3
x
−
4
=
0
x
=
1
or
x
=
-4
Question 3:
x
2
−
9
x
+
20
=
0
x
=
5
or
x
=
4
Question 4:
x
2
−
5
x
−
6
=
0
x
=
-1
or
x
=
6
Question 5:
x
2
+
11
x
+
10
=
0
x
=
-1
or
x
=
-10
Question 6:
x
2
−
8
x
−
9
=
0
x
=
9
or
x
=
-1