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Diketahui dan maka rata-rata dari nilai p adalah ….

Diketahui f to the power of negative 1 end exponent open parentheses 4 x minus 5 close parentheses equals 3 x minus 1 dan open parentheses f to the power of negative 1 end exponent ring operator f close parentheses open parentheses 5 close parentheses equals p squared plus 2 p minus 10 maka rata-rata dari nilai p adalah ….

  1. negative 4

  2. negative 2

  3. negative 1

  4. 1

  5. 4

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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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 open parentheses 5 close parentheses equals y space left right arrow f to the power of negative 1 end exponent open parentheses 4 x minus 5 close parentheses equals 3 x minus 1 S e h i n g g a space colon 3 x minus 1 equals 5 3 x equals 6 x equals 2 M a k a space colon f left parenthesis 5 right parenthesis equals 2 d a n y equals 4 x minus 5 y equals 4.2 space minus space 5 space left right arrow y equals 3 M a k a space colon f to the power of negative 1 end exponent left parenthesis 2 right parenthesis equals 3 S e h i n g g a space colon open parentheses f to the power of negative 1 end exponent ring operator f close parentheses open parentheses 5 close parentheses equals p squared plus 2 p minus 10 f to the power of negative 1 end exponent open parentheses f open parentheses 5 close parentheses close parentheses equals p squared plus 2 p minus 10 f to the power of negative 1 end exponent open parentheses 2 close parentheses equals p squared plus 2 p minus 10 3 equals p squared plus 2 p minus 10 p squared plus 2 p minus 13 equals 0  I n g a t factorial P e n j u m l a h a n space a k a r minus a k a r space p a d a space p e r s a m a a n space k u a d r a t space colon a x squared plus b x plus c equals 0 x subscript 1 plus x subscript 2 equals negative b over a S e h i n g g a space colon p squared plus 2 p minus 13 equals 0 J u m l a h space n i l a i space p space y a i t u space colon space p subscript 1 plus p subscript 2 equals space minus 2 over 1 equals negative 2 space J a d i comma space r a t a minus r a t a space n i l a i space p space a d a l a h space colon space minus 2 over 2 equals negative 1 space

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