Solving Quadratics by Factorising
Question 1:
x
2
+
9
x
=
0
x
=
0
or
x
=
-9
Question 2:
x
2
−
49
=
0
x
=
7
or
x
=
-7
Question 3:
4
x
2
−
64
=
0
x
=
4
or
x
=
-4
Question 4:
x
2
+
13
x
+
42
=
0
x
=
-7
or
x
=
-6
Question 5:
x
2
+
15
x
=
−
56
x
=
-8
or
x
=
-7
Question 6:
3
x
2
−
11
x
−
20
=
0
x
=
−
4
3
or
5
