Question

1. Tunjukkan bahwa f(x) = 3x - 2 injektif !

gunakan definisi
[tex]( ∀x_{1},x_{2} )( f(x_{1}) = f (x_{2})\: \Longrightarrow \: x_{1} = x_{2})\\[/tex]
maka :
[tex]f(x_{1}) = f(x_{2} )[/tex]
[tex]3x_{1} - 2 = 3x_{2} - 2[/tex]
[tex]3x_{1} = 3x_{2} [/tex]
[tex]x_{1} = x_{2} [/tex]
Q.E.D



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