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Penyelesaian dari 5 − 2 x + 2 + 74. 5 − x − 3 ≥ 0 adalah ....

Penyelesaian dari adalah ....

  1. begin mathsize 14px style straight x less or equal than negative 3 space atau space straight x greater or equal than 1 over 25 end style

  2. begin mathsize 14px style negative 3 less or equal than straight x less or equal than 1 over 25 end style

  3. begin mathsize 14px style straight x less or equal than 2 end style

  4. begin mathsize 14px style straight x greater or equal than 2 end style

  5. begin mathsize 14px style straight x greater or equal than negative 2 end style

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Y. Laksmi

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

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Pembahasan

begin mathsize 14px style straight i right parenthesis space Sederhanakan space bentuk space pertidaksamaan space tersebut space  space space space menggunakan space sifat minus sifat space perpangkatan comma space yaitu  space space space straight a to the power of straight p plus straight q end exponent equals straight a to the power of straight p. straight a to the power of straight q  space space space straight a to the power of pq equals open parentheses straight a to the power of straight p close parentheses to the power of straight q  space space space 5 to the power of negative 2 straight x plus 2 end exponent plus 74. space 5 to the power of negative straight x end exponent minus 3 greater or equal than 0  space space space 5 to the power of negative 2 straight x end exponent.5 squared plus 74.5 to the power of negative straight x end exponent minus 3 greater or equal than 0  space space space 25. open parentheses 5 to the power of negative straight x end exponent close parentheses squared plus 74.5 to the power of negative straight x end exponent minus 3 greater or equal than 0    ii right parenthesis space Misalkan space straight y equals 5 to the power of negative straight x end exponent  space space space space 25 open parentheses 5 to the power of negative straight x end exponent close parentheses squared plus 74.5 to the power of negative straight x end exponent minus 3 greater or equal than 0  space space space space 25 straight y squared plus 74 straight y minus 3 greater or equal than 0    iii right parenthesis space Faktorkan space ruas space kiri  space space space space space 25 straight y squared plus 74 straight y minus 3 greater or equal than 0  space space space space space open parentheses 25 straight y minus 1 close parentheses open parentheses straight y plus 3 close parentheses greater or equal than 0    iv right parenthesis space Tentukan space pembuat space nol space pada space bentuk space dari space ruas space kiri space dan space  space space space space space tempatkan space pada space garis space bilangan  space space space space space open parentheses 25 straight y minus 1 close parentheses open parentheses straight y plus 3 close parentheses greater or equal than 0  space space space space space Maka  space space space space space 25 straight y minus 1 equals 0 rightwards arrow 25 straight y equals 1 rightwards arrow straight y equals 1 over 25  space space space space space straight y plus 3 equals 0 rightwards arrow straight y equals negative 3  space space space space space Pada straight space garis straight space bilangan    end style

begin mathsize 14px style space space space space Tanda space bulat space hitam space di space atas space karena space pada space pertidaksamaan space di space atas space  space space space space mengandung space unsur space sama space dengan space left parenthesis equals right parenthesis.    straight v right parenthesis space Tentukan space tanda space dari space masing minus masing space daerah.  space space space space Jika space diuji space titik space straight y equals 0 comma space maka  space space space space open parentheses 25 straight y minus 1 close parentheses open parentheses straight y plus 3 close parentheses equals open parentheses minus close parentheses open parentheses plus close parentheses equals open parentheses minus close parentheses  space space space space Menghasilkan space bilangan space negatif comma space sehingga space daerah space yang space mengandung space  space space space space titik space straight y equals 0 space bernilai space negatif.  space space space space Daerah space yang space lain space akan space memiliki space tanda space yang space berlawanan space dengan space  space space space space daerah space tetangganya comma space sehingga end style

begin mathsize 14px style vi right parenthesis space Tetapkan space daerah space penyelesaian  space space space space space Karena space pertidaksamaan space akhir space berbentuk space  space space space space space open parentheses 25 straight y minus 1 close parentheses open parentheses straight y plus 3 close parentheses greater or equal than 0  space space space space space Maka space dipilih space daerah minus daerah space yang space bernilai space left parenthesis plus right parenthesis comma space yaitu end style

begin mathsize 14px style space space space space space Sehingga  space space space space space straight y less or equal than negative 3 space atau space straight y greater or equal than 1 over 25    vii right parenthesis space Substitusikan space kembali space straight y equals 5 to the power of negative straight x end exponent space dan space selesaikan space pertidaksamaan  space space space space space space Untuk space straight y less or equal than negative 3 space maka  space space space space space space 5 to the power of negative straight x end exponent less or equal than negative 3  space space space space space space Tidak space ada space straight x space yang space memenuhi space karena space bentuk space eksponensial space straight a to the power of straight x space selalu space positif.  space space space space space space Untuk space straight y greater or equal than 1 over 25  space space space space space space 5 to the power of negative straight x end exponent greater or equal than 1 over 25  space space space space space space 5 to the power of negative straight x end exponent greater or equal than 5 to the power of negative 2 end exponent  space space space space space space Ingat factorial space Jika space straight a to the power of straight p greater or equal than straight a to the power of straight q space dengan space straight a greater than 1 space maka space straight p greater or equal than straight q.  space space space space space space Maka  space space space space space space minus straight x greater or equal than negative 2  space space space space space space straight x less or equal than 2 end style

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