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Sagot :
add both sides by 16
so you'll have x^4 =16
take the 4th root of both sides and you'll get x= 2
so you'll have x^4 =16
take the 4th root of both sides and you'll get x= 2
[tex]{ x }^{ 4 }-16=0\\ \\ { x }^{ 4 }=16\\ \\ x=\pm \sqrt [ 4 ]{ 16 } \\ \\ \therefore \quad x=\pm 2[/tex]
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