Solving Quadratics by Factorising
Question 1:
x
2
−
7
x
=
0
x
=
0
or
x
=
7
Question 2:
x
2
−
100
=
0
x
=
10
or
x
=
-10
Question 3:
5
x
2
−
80
=
0
x
=
4
or
x
=
-4
Question 4:
x
2
+
3
x
−
54
=
0
x
=
-9
or
x
=
6
Question 5:
x
2
25
x
=
5
or
x
=
-5
Question 6:
5
x
2
+
28
x
−
12
=
0
x
=
2
5
or
−
6