Diketahui:
1) |2x + 1| = 11 + x
2) |2x + 1| - 2 = 3
Ditanyakan:
Hasilnya
Jawab:
|2x + 1|² = (11 + x)²
4x² + 4x + 1 = 121 + 22x + x²
3x² - 18x - 120 = 0
x² - 6x - 40 = 0
x² - 10x + 4x - 40 = 0
x (x-10) + 4 (x-10) = 0
(x+4)(x-10) = 0
x=-4 atau x=10
2) |2x+1| - 2 = 3
|2x+1| = 5
|2x+1|² = 5²
4x² + 4x + 1 = 25
4x² + 4x - 24 = 0
x² + x - 6 = 0
x² + 3x - 2x - 6 = 0
x (x+3) - 2 (x+3) = 0
(x-2)(x+3) = 0
x=2 atau x=-3
_________________________________________
DETAIL JAWABAN
Mapel: Matematika
Kelas: 10
Materi: Bab 1 - Persamaan dan Pertidaksamaan Linear Nilai Mutlak Satu Variabel
Kata kunci: Nilai Mutlak
Kode Soal: 2
Kode kategorisasi: 10.2.1
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Diketahui:
1) |2x + 1| = 11 + x
2) |2x + 1| - 2 = 3
Ditanyakan:
Hasilnya
Jawab:
1) |2x + 1| = 11 + x
|2x + 1|² = (11 + x)²
4x² + 4x + 1 = 121 + 22x + x²
3x² - 18x - 120 = 0
x² - 6x - 40 = 0
x² - 10x + 4x - 40 = 0
x (x-10) + 4 (x-10) = 0
(x+4)(x-10) = 0
x=-4 atau x=10
2) |2x+1| - 2 = 3
|2x+1| = 5
|2x+1|² = 5²
4x² + 4x + 1 = 25
4x² + 4x - 24 = 0
x² + x - 6 = 0
x² + 3x - 2x - 6 = 0
x (x+3) - 2 (x+3) = 0
(x-2)(x+3) = 0
x=2 atau x=-3
_________________________________________
DETAIL JAWABAN
Mapel: Matematika
Kelas: 10
Materi: Bab 1 - Persamaan dan Pertidaksamaan Linear Nilai Mutlak Satu Variabel
Kata kunci: Nilai Mutlak
Kode Soal: 2
Kode kategorisasi: 10.2.1