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Buktikan kebenaran setiap deret berikut. b. 2 + 5 + 8 + ... + ( 3 n − 1 ) = 2 n ( 3 n + 1 ) ​

Buktikan kebenaran setiap deret berikut. 

b.  

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Mahasiswa/Alumni UIN Walisongo Semarang

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terbukti bahwa karena hasil sisi kanan dan kiri sama

terbukti bahwa 2 plus 5 plus 8 plus... plus open parentheses 3 straight n minus 1 close parentheses equals fraction numerator straight n open parentheses 3 straight n plus 1 close parentheses over denominator 2 end fraction karena hasil sisi kanan dan kiri sama

Pembahasan

Untuk n = 1 maka Untuk n = k diasumsikan terbukti maka Untuk n = k+1 Jadi terbukti bahwa karena hasil sisi kanan dan kiri sama

Untuk n = 1 maka

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 plus 5 plus 8 plus... plus open parentheses 3 straight n minus 1 close parentheses end cell equals cell fraction numerator straight n open parentheses 3 straight n plus 1 close parentheses over denominator 2 end fraction end cell row cell 2 plus 5 plus 8 plus... plus open parentheses 3.1 minus 1 close parentheses end cell equals cell fraction numerator 1 open parentheses 3.1 plus 1 close parentheses over denominator 2 end fraction end cell row cell 2 plus 5 plus 8 plus... plus 2 end cell equals cell 4 over 2 end cell row cell 2 plus 5 plus 8 plus... plus 2 end cell equals cell 2 rightwards arrow terbukti space end cell end table

Untuk n = k diasumsikan terbukti maka

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 plus 5 plus 8 plus... plus open parentheses 3 straight n minus 1 close parentheses end cell equals cell fraction numerator straight n open parentheses 3 straight n plus 1 close parentheses over denominator 2 end fraction end cell row cell 2 plus 5 plus 8 plus... plus open parentheses 3. straight k minus 1 close parentheses end cell equals cell fraction numerator straight k open parentheses 3. straight k plus 1 close parentheses over denominator 2 end fraction end cell row cell 2 plus 5 plus 8 plus... plus left parenthesis 3 straight k minus 1 right parenthesis end cell equals cell fraction numerator straight k left parenthesis 3 straight k plus 1 right parenthesis over denominator 2 end fraction rightwards arrow terbukti end cell end table

Untuk n = k+1

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 plus 5 plus 8 plus... plus open parentheses 3 straight n minus 1 close parentheses end cell equals cell fraction numerator straight n open parentheses 3 straight n plus 1 close parentheses over denominator 2 end fraction end cell row cell 2 plus 5 plus 8 plus... plus left parenthesis 3 straight k minus 1 right parenthesis plus open parentheses 3 left parenthesis straight k plus 1 right parenthesis minus 1 close parentheses end cell equals cell fraction numerator straight k plus 1 open parentheses 3 left parenthesis straight k plus 1 close parentheses plus 1 right parenthesis over denominator 2 end fraction end cell row cell fraction numerator 3 straight k squared plus straight k over denominator 2 end fraction plus open parentheses 3 left parenthesis straight k plus 1 right parenthesis minus 1 close parentheses end cell equals cell fraction numerator straight k plus 1 open parentheses 3 left parenthesis straight k plus 1 close parentheses plus 1 right parenthesis over denominator 2 end fraction end cell row cell fraction numerator 3 straight k squared plus straight k over denominator 2 end fraction plus open parentheses 3 straight k plus 2 close parentheses end cell equals cell fraction numerator left parenthesis straight k plus 1 right parenthesis left parenthesis 3 straight k plus 4 right parenthesis over denominator 2 end fraction end cell row cell fraction numerator 3 straight k left parenthesis straight k plus 1 right parenthesis over denominator 2 end fraction plus fraction numerator 2 open parentheses 3 straight k plus 2 close parentheses over denominator 2 end fraction end cell equals cell fraction numerator left parenthesis straight k plus 1 right parenthesis left parenthesis 3 straight k plus 4 right parenthesis over denominator 2 end fraction end cell row cell fraction numerator 3 straight k squared plus 7 straight k plus 4 over denominator 2 end fraction end cell equals cell fraction numerator left parenthesis straight k plus 1 right parenthesis left parenthesis 3 straight k plus 4 right parenthesis over denominator 2 end fraction end cell row cell fraction numerator left parenthesis straight k plus 1 right parenthesis left parenthesis 3 straight k plus 4 right parenthesis over denominator 2 end fraction end cell equals cell fraction numerator left parenthesis straight k plus 1 right parenthesis left parenthesis 3 straight k plus 4 right parenthesis over denominator 2 end fraction rightwards arrow Terbukti space end cell end table

Jadi terbukti bahwa 2 plus 5 plus 8 plus... plus open parentheses 3 straight n minus 1 close parentheses equals fraction numerator straight n open parentheses 3 straight n plus 1 close parentheses over denominator 2 end fraction karena hasil sisi kanan dan kiri sama

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