Q24 of 274 Page 64

Factorize:

x4 – 625

We have:



We can also write this as:


=(x2)2 – (25)2


Using identity: a2 - b2 = (a – b)(a + b)


=(x2 + 25)(x2 – 25)


Again,


Using identity: a2 - b2 = (a – b)(a + b)



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