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Solutia reala a ecuatiei radical din (2x-5) la a doua=9

Răspuns :

(2x - 5)^2 = 9
2x - 5 = v9
2x - 5 = 3
2x = 3 + 5
2x = 8
x = 8 : 2
x = 4
[tex]\sqrt{(2x-5)^2}=9\\ |2x-5|=9\\ 2x-5=9\ sau\ 2x-5=-9\\ 2x=14 \ sau\ 2x=-4\\ x=7\ sau\ x=-2\\ x\in\{-2,7\}[/tex]