June 2019 1 78 Report
3 log (x^2 + 1) . 5 log 3 = 5 log (x+21) apabila x = ...
A. 3
B. 4
C. 5
D. -5 atau 4
E. -4 atau 5

Note
= letak 3 diatas log (x^2 +1)
= letak 5 diatas log 3
= letak 5 diatas log (x+21)

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