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Prove that the following are true for all positive integral value of n. Use mathematical induction. 1. a + ( a + b ) + ( a + 2 b ) + . . . + [ a + ( n − 1 ) b ] = 2 n ​ ( 2 a + ( n − 1 ) b

Prove that the following are true for all positive integral value of n. Use mathematical induction. 

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A. Acfreelance

Master Teacher

Mahasiswa/Alumni UIN Walisongo Semarang

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Pembahasan

Mensubsitusi nilai a dan b maka Akan dibuktikan untuk n = 1 maka untuk n = k diasumsikan terbukti maka Untuk n = k+1 maka Jadi terbukti bahwa karena hasil sisi kanan dan kiri sama

Mensubsitusi nilai a dan b maka

table attributes columnalign right center left columnspacing 0px end attributes row straight a equals cell 1 space dan space straight b space equals 2 end cell row cell straight a plus left parenthesis straight a plus straight b right parenthesis plus left parenthesis straight a plus 2 straight b right parenthesis space plus space. space. space. space plus space left square bracket straight a plus left parenthesis straight n minus 1 right parenthesis straight b right square bracket space end cell equals cell straight n over 2 left parenthesis 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight b end cell row cell 1 plus left parenthesis 1 plus 2 right parenthesis plus left parenthesis 1 plus 2.2 right parenthesis plus.... plus left square bracket 1 plus left parenthesis straight n minus 1 right parenthesis 2 right square bracket end cell equals cell straight n over 2 left parenthesis 2.1 plus left parenthesis straight n minus 1 right parenthesis 2 end cell row cell 1 plus 3 plus 5 plus... plus left square bracket 1 plus 2 straight n minus 2 right square bracket end cell equals cell straight n over 2 left parenthesis 2 plus 2 straight n minus 2 right parenthesis end cell row cell open parentheses 2 straight n minus 1 close parentheses end cell equals cell straight n over 2 left parenthesis 2 straight n right parenthesis end cell row cell left parenthesis 2 straight n minus 1 right parenthesis end cell equals cell straight n squared end cell end table

Akan dibuktikan untuk n = 1 maka

table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis 2 straight n minus 1 right parenthesis end cell equals cell straight n squared end cell row cell left parenthesis 2.1 minus 1 right parenthesis end cell equals cell 1 squared end cell row 1 equals cell 1 rightwards arrow Terbukti end cell end table

untuk n = k diasumsikan terbukti maka

table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis 2 straight n minus 1 right parenthesis end cell equals cell straight n squared end cell row cell left parenthesis 2. straight k minus 1 right parenthesis end cell equals cell straight k squared end cell row cell 2 straight k minus 1 end cell equals cell straight k squared rightwards arrow Terbukti end cell end table

Untuk n = k+1 maka

table attributes columnalign right center left columnspacing 0px end attributes row cell 1 plus 3 plus 5 plus... plus left parenthesis 2 straight k minus 1 right parenthesis plus left parenthesis 2 left parenthesis straight k plus 1 right parenthesis minus 1 right parenthesis end cell equals cell left parenthesis straight k plus 1 right parenthesis squared space end cell row cell 1 plus 3 plus 5 plus... plus straight k squared plus 2 straight k plus 1 end cell equals cell straight k squared plus 2 straight k plus 1 end cell row cell straight k squared plus 2 straight k plus 1 end cell equals cell straight k squared plus 2 straight k plus 1 rightwards arrow Terbukti end cell end table

Jadi terbukti bahwa straight a plus left parenthesis straight a plus straight b right parenthesis plus left parenthesis straight a plus 2 straight b right parenthesis space plus space. space. space. space plus space left square bracket straight a plus left parenthesis straight n minus 1 right parenthesis straight b right square bracket space equals straight n over 2 left parenthesis 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight b karena hasil sisi kanan dan kiri sama

 

 

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