Question

Factorise completely.
(a) x4 - 16​

Answer 1

Answer:

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Answer 2

Answer:

step 1 :-

first write in square form

(x²)²-4²

using a²-b² =(a-b)(a+b)

(x²-4)(x²+4)

now again writing x²-4= (x-2)(x+2)

so the final answer is :-

(x-2)(x+2)(x²+4)