Factorise x7^y+xy^3
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ANSWER
3x
7
y−81x
4
y
4
=3x
4
y(x
3
−27y
3
)
=3x
4
y(x
3
−(3y)
3
)
Using a
3
−b
3
=(a−b)(a
2
+ab+b
2
),we get
3x
4
y(x−3y)(x
2
+x(3y)+(3y)
2
)
=3x
4
y(x−3y)(x
2
+3xy+9y
2
)
Hope it helps you
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