Solving Quadratics by Factorising
Question 1:
4
x
2
+
7
x
−
15
=
0
x
=
5
4
or
−
3
Question 2:
5
x
2
+
21
x
+
4
=
0
x
=
−
1
5
or
−
4
Question 3:
3
x
2
−
5
x
+
2
=
0
x
=
2
3
or
1
Question 4:
5
x
2
−
x
−
6
=
0
x
=
6
5
or
−
1
Question 5:
4
x
2
+
4
x
−
3
=
0
x
=
1
2
or
−
3
2
Question 6:
9
x
2
+
12
x
−
5
=
0
x
=
−
5
3
or
1
3
