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2.
3.
4.
, x=-4 ruas kanan menghasilkan log (-) sehingga tidak memenuhi. ambil x= 7
5. ³Log 2.²Log 5 = 1/a. b = b/a
³Log 5 = b/a
³Log (3x25) = ³Log 3+³Log 5²
= 1 + 2 (b/a)
6. D= E+7 -----> D-E =7
2E = D+2 ---> D-2E= -2
------------------ -
E = 9
D= 9+7 = 16
D+E = 25
7. a= 5
b= 8
a+ b= 30 --->b= 30-a
5a+8b≤ 177
5a+8(30-a)≤ 177
5a+240-8a≤ 177
-3a ≤ -63
a ≥ 9