Question

X⁴-1=0
HOW MAMY ANSWERS ARE CORRECT​

Answer 1

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x⁴−1=0

⇒  (x²)²−(1²)²=0

⇒  (x²+1²)(x²−1²)=0

⇒  Now, x²+1=0 and x²−1=0

⇒  x¹=−1  and x²=1

⇒  x=±√−1   and x=±1

⇒  x=±i and x=±1

∴  The roots are 1,−1,i,−i