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Jika p + 1 dan p - 1 adalah akar-akar persamaan ma...

Jika p + 1 dan p - 1 adalah akar-akar persamaan space straight x squared space equals space 4 straight x space plus space straight a equals space 0 space maka nilai a adalah ...

  1. 0

  2. 1

  3. 2

  4. 3

  5. 4

Jawaban:

straight x subscript 1 space equals straight p plus 1 spacedan straight x subscript 2 equals straight p space minus 1

straight x subscript blank squared end subscript space equals space 4 straight x space plus straight a space equals 0 rightwards arrow straight a equals 1 space semicolon space straight b equals negative 4 semicolon space straight c space equals space 0  straight x subscript 1 plus straight x subscript blank squared end subscript equals negative straight b over straight a  straight p plus space straight l space plus space straight p minus space 1 space equals space 4 space  2 straight p equals 4 space  straight p space equals space 2  straight x subscript 1 space equals space 2 plus 1 equals 3  straight x subscript blank squared end subscript space equals space 2 minus 1 equals 1  straight x subscript 1. straight x subscript blank squared end subscript equals straight c over straight a  3.1 equals straight a left right double arrow straight a equals 3

0

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