Factorise: (25x² + 4) - (5x + 4)
Answers
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0
Answer:
Rewrite
25
x
2
as
(
5
x
)
2
.
(
5
x
)
2
−
4
Rewrite
4
as
2
2
.
(
5
x
)
2
−
2
2
Since both terms are perfect squares, factor using the difference of squares formula,
a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
where
a
=
5
x
and
b
=
2
.
(
5
x
+
2
)
(
5
x
−
2
)
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