evaluate using identity (a+4) (a-4)
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a
4
−b
4
=(a
2
)
2
−(b
2
)
2
=(a
2
−b
2
)(a
2
+b
2
)
=(a−b)(a+b)(a
2
+b
2
)
Hence factorised
Formula:
x
2
−y
2
=(x−y)(x+
4
−b
4
=(a
2
)
2
−(b
2
)
2
=(a
2
−b
2
)(a
2
+b
2
)
=(a−b)(a+b)(a
2
+b
2
)
Hence factorised
Formula:
x
2
−y
2
=(x−y)(x+
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