a) factorise 125a^4-45
Answers
Answered by
1
Answer:
Given : 125a
3
+
8
1
According to equation,
a
3
+b
3
=(a+b)(a
2
−ab+b
2
)
So we get,
125a
3
+
8
1
=(5a)
3
+
2
1
3
On the basis of formula,
=(5a+
2
1
)((5a)
2
−(5a)(
2
1
)(
2
1
)
2
)
125a
3
+
8
1
=(5a+
2
1
)(25a
2
−
2
5
a+
4
1
)
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