1. Selesaikanlah.
b. ln (β(x + 4) + 2) / ln βx = 2
Jawaban :
ln (β(x + 4) + 2) / ln βx = 2
ln (β(x + 4) + 2) = 2 ln βx
ln (β(x + 4) + 2) = 2 ln (x)1/2
ln (β(x + 4) + 2) = 2 . 1/2 ln x
ln (β(x + 4) + 2) = 2 . ln x
β(x + 4) + 2 = x
β(x + 4) = x - 2
x + 4 = (x - 2)2
x + 4 = x2 - 4x + 4
0 = x2 - 4x - x + 4 - 4
0 = x2 - 5x
0 = x (x - 5)
x = 0
atau x = 5
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