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(x-2)^4=9^2 cum se face dau coroana

Răspuns :

(x-2)^4=9^2
(x-2)^4=(3^2)^2
(x-2)^4=3^4
x-2=3
x=3+2
x=5
[tex] (x-2)^{4} = 9^{2} \\ (x-2) ^{2} =+-9 \\ x-2=+- \sqrt{9} \\ x=+- \sqrt{9} +2[/tex]