find all roots of equation x^11-x^7+x^4-1=0
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☆QUESTION☆
Find all roots of equation x^11-x^7+x^4-1=0
☆ ANSWER ☆
➡x^11 - x^7 + x^4 - 1 = 0
➡x^7 (x^4 - 1) +( x^4 - 1 )=0
➡(x^7-1) (x^4-1) = 0
➡x^7 = -1 , x^4 =1
➡x = + 1 , - 1 .
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