Question

Determinati x € R, astfel incat 3x +1; 15; 12 si 8 sa fie termeni unei proporti. ( ajutor )

Answer 1

[tex]\it \dfrac{3x+1}{8}=\dfrac{15}{12} \Rightarrow 3x+1 = \dfrac{8\cdot15}{12}\Rightarrow 3x+1 = \dfrac{120}{12} \Rightarrow 3x+1=10 \\\;\\ \Rightarrow 3x=9\Rightarrow x = 3\ .[/tex]