Pertanyaan

Jika maka nilai a sehingga f ( a ) = − 4 adalah....

Jika $f to the power of negative 1 end exponent open parentheses fraction numerator x plus 5 over denominator x minus 5 end fraction close parentheses equals fraction numerator 8 over denominator x plus 5 end fraction$ maka nilai a sehingga $f (a) = - 4$ adalah....

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Habis dalam

Klaim

N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

$f open parentheses x close parentheses equals y space left right arrow f to the power of negative 1 end exponent open parentheses y close parentheses equals x M a k a space colon f to the power of negative 1 end exponent open parentheses fraction numerator x plus 5 over denominator x minus 5 end fraction close parentheses equals fraction numerator 8 over denominator x plus 5 end fraction space left right arrow f open parentheses a close parentheses equals negative 4 space m a k a space colon fraction numerator x plus 5 over denominator x minus 5 end fraction equals negative 4 x plus 5 equals negative 4 x plus 20 x plus 4 x equals 20 minus 5 5 x equals 15 x equals 3 S e h i n g g a space colon a equals fraction numerator 8 over denominator x plus 5 end fraction equals fraction numerator 8 over denominator 3 plus 5 end fraction equals 1$