Sunday, November 7, 2021

Soal dan Pembahasan Logaritma Kelas X Sukino Peminatan LKS 5 Bag C no 1b

1. Selesaikanlah.

b. ln (√(x + 4) + 2) / ln √x = 2


Jawaban :

ln (√(x + 4) + 2) / ln √x = 2

ln (√(x + 4) + 2) = 2 ln √x

ln (√(x + 4) + 2) = 2 ln (x)1/2

ln (√(x + 4) + 2) = 2 . 1/2 ln x

ln (√(x + 4) + 2) = 2 . ln x

√(x + 4) + 2 = x

√(x + 4) = x - 2

x + 4 = (x - 2)2

x + 4 = x- 4x + 4

0 = x- 4x - x + 4 - 4

0 = x- 5x

0 = x (x - 5)


x = 0

atau x = 5



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