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Akar-akar persamaan adalah dan . Jika , maka nilai...

Akar-akar persamaan space 3 straight x squared space minus space 5 straight x space plus left parenthesis 2 straight p space minus 1 right parenthesis space equals space 0 spaceadalah space straight x subscript 1 spacedan space straight x subscript 2 space. Jika space x subscript 1 space. space straight x subscript 2 space equals space 7, maka nilai p adalah...

  1. 11

  2. 10

  3. 9

  4. 4

  5. 5

Jawaban:

3 straight x squared minus space 5 straight x space plus left parenthesis space 2 straight p minus 1 right parenthesis space equals 0 space rightwards arrow straight a equals 3 semicolon space straight b equals negative space 5 semicolon space straight c equals 2 straight p space minus space 1  straight x subscript 1. straight x subscript 2 equals 7  fraction numerator 2 straight p space minus space 1 over denominator 3 end fraction equals 7  2 straight p space minus space 1 equals 21  2 straight p equals 22  straight p equals 11

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