Hasil dari |2x-9|=21 adalah???

| 2x - 9 | = 21

2x - 9 = 21

2x = 21 + 9

x = 30 / 2

x = 15

2x - 9 = - 21

2x = -21 + 9

x = -12 / 2

x = - 6

Atau

(2x - 9)² = 21²

(2x - 9)² - 21² = 0

(2x - 9 + 21) (2x - 9 - 21) = 0

(2x + 12) (2x - 30) = 0

2x + 12 = 0

2x = -12

x = -12/2

x = -6

2x - 30 = 0

2x = 30

x = 30/2

x = 15

Kelas 10

Pelajaran Matematika

Bab 2 Persamaan dan Fungsi Kuadrat

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Kode kategorisasi : 10.2.2

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