Tentukan nilai x jika : ⁴ ㏒ (x² + 2x - 14) = ⁷ ㏒ (x² + 2x - 14)
Matematika
UjangFirman
Pertanyaan
Tentukan nilai x jika :
⁴ ㏒ (x² + 2x - 14) = ⁷ ㏒ (x² + 2x - 14)
⁴ ㏒ (x² + 2x - 14) = ⁷ ㏒ (x² + 2x - 14)
1 Jawaban
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1. Jawaban arsetpopeye
4log(x^2 + 2x - 14) = 7log(x^2 + 2x - 14)
4log1 = 7log1 = 0
Maka
x^2 + 2x - 14 = 1
x^2 + 2x - 15 = 0
(x + 5)(x - 3) = 0
x = -5 atau x = 3