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∣2 x − 2∣ + ∣3 x − 7∣ + ∣3 − x ∣ jika x < 1

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M. Mariyam

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

Jawaban terverifikasi

Jawaban

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 table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line 2 x minus 2 vertical line plus vertical line 3 x minus 7 vertical line plus vertical line 3 minus x vertical line end cell equals cell 12 minus 6 x end cell end table.

Pembahasan

Ingat kembali konsep definisi nilai mutlak sebagai berikut: Oleh karena itu, untuk menyelesaikan , maka Untuk , maka fungsi nilai mutlak yang digunakan adalah sehingga, Dengan demikian, .

Ingat kembali konsep definisi nilai mutlak sebagai berikut:

open vertical bar f open parentheses x close parentheses close vertical bar equals open curly brackets table attributes columnalign left columnspacing 1.4ex end attributes row cell f open parentheses x close parentheses end cell cell comma space f open parentheses x close parentheses greater or equal than 0 end cell row cell negative f open parentheses x close parentheses end cell cell comma space f open parentheses x close parentheses less than 0 end cell end table close

Oleh karena itu, untuk menyelesaikan vertical line 2 x minus 2 vertical line plus vertical line 3 x minus 7 vertical line plus vertical line 3 minus x vertical line space jika space x less than 1, maka

open vertical bar 2 x minus 2 close vertical bar equals open curly brackets table attributes columnalign left columnspacing 1.4ex end attributes row cell 2 x minus 2 end cell cell comma space x greater or equal than 1 end cell row cell 2 minus 2 x end cell cell comma space x less than 1 end cell end table close

open vertical bar 3 x minus 7 close vertical bar equals open curly brackets table attributes columnalign left columnspacing 1.4ex end attributes row cell 3 x minus 7 end cell cell comma space x greater or equal than 7 over 3 end cell row cell 7 minus 3 x end cell cell comma space x less than 7 over 3 end cell end table close

open vertical bar 3 minus x close vertical bar equals open curly brackets table attributes columnalign left columnspacing 1.4ex end attributes row cell 3 minus x end cell cell comma space x less or equal than 3 end cell row cell x minus 3 end cell cell comma space x greater than 3 end cell end table close

Untuk x less than 1, maka fungsi nilai mutlak yang digunakan adalah

open vertical bar 2 x minus 2 close vertical bar equals 2 minus 2 x open vertical bar 3 x minus 7 close vertical bar equals 7 minus 3 x open vertical bar 3 minus x close vertical bar equals 3 minus x

sehingga,

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line 2 x minus 2 vertical line plus vertical line 3 x minus 7 vertical line plus vertical line 3 minus x vertical line end cell equals cell 2 minus 2 x plus 7 minus 3 x plus 3 minus x end cell row blank equals cell 12 minus 6 x end cell end table

Dengan demikian, table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line 2 x minus 2 vertical line plus vertical line 3 x minus 7 vertical line plus vertical line 3 minus x vertical line end cell equals cell 12 minus 6 x end cell end table.

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