Question

factorise a^8 - 47a^4 + 1

Answer 1

x8+x4+1

x8+2x4•1-x4+1

x8+2x4•1+1-x2

(x4+1)2-x2

x2 as(x2)2

(x4+1)2-(x)2

(x4+1+x2) (x2+1-x2)



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