Jawabanmu

Jawaban paling cerdas!
2014-09-06T07:06:39+07:00
2.
 (\frac{1}{4} )^{x+2} = \sqrt[3]{ 8^{2x-1} }  \\  ( 2^{-2} )^{x+2} = \sqrt[3]{ ( 2^{3} )^{2x-1} }  \\ 2^{-2x-4} = 2^{3( \frac{ 2x-1}{3})} \\ 2^{-2x-4} = 2^{ 2x-1}\\ -2x-4=2x-1 \\ 4x=-3 \\ x= \frac{-3}{4}  \\  \\ 81^{x} =81^{ \frac{-3}{4}}= 3^{4( \frac{-3}{4} )}  = 3^{-3}= \frac{1}{27} ... (D)

3.
5^{2x}+ 5^{-2x}=34 \\ 5^{x}+ 5^{-x}=?\\  \\(5^{x}+ 5^{-x})^{2} =5^{2x}+ 2.5^{x}5^{-x}+5^{-2x}=(5^{2x}+5^{-2x})+2.5^{x}. \frac{1}{5^{x}} =34+2=36
maka 5^{x}+ 5^{-x}= \sqrt{36}=6

4.
\sqrt{ \frac{(\frac{2}{10} )^{3-2x} }{(\frac{4}{100} )^{3x-1}} } = \frac{8}{1000} \\ \\ \frac{(\frac{2}{10} )^{3-2x} }{(\frac{4}{100} )^{3x-1}} = (\frac{8}{1000})^{2} \\ \\ \frac{(\frac{2}{10} )^{3-2x} }{(\frac{2}{10} )^{2(3x-1)}}= (\frac{2}{10})^{3(2)} \\ \\ (\frac{2}{10} )^{3-2x-(6x-2)} }=(\frac{2}{10})^{6} \\ \\ (\frac{2}{10} )^{5-8x} }=(\frac{2}{10})^{6} \\ \\ 5-8x=6 \\ 8x=-1 \\ x= \frac{-1}{8}
liat ja di profil q kak?
gny loh soal nya,,, jika x1 dan x2 penyelesaian persamaan (4/9)pangkat xpangkat2-3 (8/27)pankat 1-x = 3/2,nilai (x1-x2)pankat2=......
kak bantu aq donk
PLESE BNTU AQ DONK
soalnya?