Question

evaluate using identity (a+4) (a-4)​

Answer 1

Here's the required answer to your question

Answer 2

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+