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Bilangan suku ke- n dari suatu barisan bilangan ditenukan oleh formula berikut Tentukan nilai dari U 25 ​

Bilangan suku ke- dari suatu barisan bilangan ditenukan oleh formula berikut

begin mathsize 14px style U subscript n equals fraction numerator open square brackets 1 plus square root of 5 close square brackets to the power of n minus open square brackets 1 minus square root of 5 close square brackets to the power of n over denominator 2 to the power of n square root of 5 end fraction end style 

Tentukan nilai dari  

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  2. ...undefined 

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N. Ayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Padang

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nilai adalah

nilai begin mathsize 14px style U subscript 25 end style adalah begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1 over 2 to the power of 24 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell left square bracket C subscript 1 superscript 25 plus C subscript 3 superscript 25 5 plus... plus 2 C subscript 25 superscript 25 5 to the power of 12 right square bracket end cell end table end style

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Perhatikan perhitungan berikut ini. Nilai didapatkan: Jadi, nilai adalah

Perhatikan perhitungan berikut ini.

begin mathsize 14px style U subscript n equals fraction numerator open square brackets 1 plus square root of 5 close square brackets to the power of n minus open square brackets 1 minus square root of 5 close square brackets to the power of n over denominator 2 to the power of n square root of 5 end fraction end style

Nilai begin mathsize 14px style U subscript 25 end style didapatkan:

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell U subscript n end cell equals cell fraction numerator left square bracket 1 plus square root of 5 right square bracket to the power of n minus left square bracket 1 minus square root of 5 right square bracket to the power of n over denominator 2 to the power of n square root of 5 end fraction end cell row cell U subscript 25 end cell equals cell fraction numerator left square bracket 1 plus square root of 5 right square bracket to the power of 25 minus left square bracket 1 minus square root of 5 right square bracket to the power of 25 over denominator 2 to the power of 25 square root of 5 end fraction end cell row blank equals cell fraction numerator open square brackets table row cell open parentheses C subscript 0 superscript 25 times 1 to the power of 25 times open parentheses square root of 5 close parentheses to the power of 0 plus C subscript 1 superscript 25 times 1 to the power of 24 times left parenthesis square root of 5 right parenthesis to the power of 1 plus... plus C subscript 25 superscript 25 times 1 to the power of 0 times left parenthesis square root of 5 right parenthesis to the power of 25 close parentheses minus end cell row cell open parentheses C subscript 0 superscript 25 times 1 to the power of 25 times left parenthesis square root of 5 right parenthesis to the power of 0 minus C subscript 1 superscript 25 times 1 to the power of 24 times left parenthesis square root of 5 right parenthesis to the power of 1 plus... negative C subscript 25 superscript 25 times 1 to the power of 0 times left parenthesis square root of 5 right parenthesis to the power of 25 close parentheses end cell end table close square brackets over denominator 2 to the power of 25 square root of 5 end fraction end cell row blank equals cell fraction numerator 2 C subscript 1 superscript 25 times square root of 5 plus 2 C subscript 3 superscript 25 times left parenthesis square root of 5 right parenthesis cubed plus... plus 2 C subscript 25 superscript 25 times left parenthesis square root of 5 right parenthesis to the power of 25 over denominator 2 to the power of 25 square root of 5 end fraction end cell row blank equals cell fraction numerator 2 square root of 5 left square bracket C subscript 1 superscript 25 plus C subscript 3 superscript 25 5 plus... plus 2 C subscript 25 superscript 25 5 to the power of 12 right square bracket over denominator 2 to the power of 25 square root of 5 end fraction end cell row blank equals cell 1 over 2 to the power of 24 left square bracket C subscript 1 superscript 25 plus C subscript 3 superscript 25 5 plus... plus 2 C subscript 25 superscript 25 5 to the power of 12 right square bracket end cell end table end style

Jadi, nilai begin mathsize 14px style U subscript 25 end style adalah begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1 over 2 to the power of 24 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell left square bracket C subscript 1 superscript 25 plus C subscript 3 superscript 25 5 plus... plus 2 C subscript 25 superscript 25 5 to the power of 12 right square bracket end cell end table end style

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