Factorise (3 – 4y – 7y2)² – (4y + 1)²
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Answer:
(
3
−
4
−
7
2
)
2
−
1
(
4
+
1
)
2
(3-4y-7y^{2})^{2}-1(4y+1)^{2}
(
−
7
2
−
4
+
3
)
2
−
1
(
4
+
1
)
2
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