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lg (x+9)-2=1/2*lg (2x+3)-lg25
Ajutati-ma va rog !


Răspuns :

[tex] 25(x+9)=100 \sqrt{2x+3} /:25 \\ x+9=4 \sqrt{2x+3} \\ x^{2} +18x+81=32x+48 \\ x^{2} -14x+33=0 \\ x_{1} =11; x_{2}=3 [/tex]