Solving Quadratics by Factorising
Question 1:
x
2
+
8
x
−
9
=
0
x
=
1
or
x
=
-9
Question 2:
x
2
+
x
−
12
=
0
x
=
3
or
x
=
-4
Question 3:
x
2
−
2
x
−
80
=
0
x
=
10
or
x
=
-8
Question 4:
x
2
−
9
x
−
10
=
0
x
=
-1
or
x
=
10
Question 5:
x
2
−
9
x
+
14
=
0
x
=
2
or
x
=
7
Question 6:
x
2
+
8
x
−
20
=
0
x
=
-10
or
x
=
2
