[tex]f(x) = 2x + 5[/tex]
[tex]f {}^{ - 1} (3)[/tex]
[tex]y = 2x + 5[/tex]
[tex]y - 5 = 2x[/tex]
[tex] \frac{y - 5}{2} = x[/tex]
[tex]f {}^{ - 1} (x) = \frac{x - 5}{2} [/tex]
[tex]f {}^{ - 1} (3) = \frac{3 - 5}{2} [/tex]
[tex]f {}^{ - 1} (3) = \frac{ - 2}{2} [/tex]
[tex]f {}^{ - 1} (3) = - 1[/tex]
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diketahui
[tex]f(x) = 2x + 5[/tex]
ditanya
[tex]f {}^{ - 1} (3)[/tex]
penyelesaian
[tex]f(x) = 2x + 5[/tex]
[tex]y = 2x + 5[/tex]
[tex]y - 5 = 2x[/tex]
[tex] \frac{y - 5}{2} = x[/tex]
[tex]f {}^{ - 1} (x) = \frac{x - 5}{2} [/tex]
[tex]f {}^{ - 1} (3) = \frac{3 - 5}{2} [/tex]
[tex]f {}^{ - 1} (3) = \frac{ - 2}{2} [/tex]
[tex]f {}^{ - 1} (3) = - 1[/tex]
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jawaban adalah -1