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Dengan menggunakan teorema limit, tentukan turunan dari tiap fungsi berikut pada nilai x yang ditentukan! D. f ( x ) = 2 x ​ ,pada x = 8

Dengan menggunakan teorema limit, tentukan turunan dari tiap fungsi berikut pada nilai  yang ditentukan!

D. , pada 

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E. Dwi

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

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turunan ,pada adalah .

 turunan begin mathsize 14px style f open parentheses x close parentheses equals square root of 2 x end root end style, pada begin mathsize 14px style x equals 8 end style adalah begin mathsize 14px style 1 fourth end style.

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Pembahasan

Menggunakan pendekatan limit maka definisi turunan yaitu: maka turunan ,pada menggunakan pendekatan limit: Jadi,turunan ,pada adalah .

Menggunakan pendekatan limit maka definisi turunan yaitu:

begin mathsize 14px style fraction numerator d y over denominator d x end fraction equals f apostrophe open parentheses x close parentheses equals limit as increment x rightwards arrow 0 of open parentheses fraction numerator f open parentheses x plus increment x close parentheses minus f open parentheses x close parentheses over denominator increment x end fraction close parentheses end style

maka turunan begin mathsize 14px style f open parentheses x close parentheses equals square root of 2 x end root end style, pada begin mathsize 14px style x equals 8 end style menggunakan pendekatan limit:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe open parentheses x close parentheses end cell equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator f open parentheses x plus h close parentheses minus f open parentheses x close parentheses over denominator h end fraction close parentheses end cell row blank equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator square root of 2 open parentheses 8 plus h close parentheses end root minus square root of 2 open parentheses 8 close parentheses end root over denominator h end fraction close parentheses end cell row blank equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator square root of 16 plus 2 h end root minus square root of 16 over denominator h end fraction close parentheses end cell row blank equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator square root of 16 plus 2 h end root minus square root of 16 over denominator h end fraction cross times fraction numerator square root of 16 plus 2 h end root plus square root of 16 over denominator square root of 16 plus 2 h end root plus square root of 16 end fraction close parentheses end cell row blank equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator 16 plus 2 h minus 16 over denominator h open parentheses square root of 16 plus 2 h end root plus square root of 16 close parentheses end fraction close parentheses end cell row blank equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator 2 h over denominator h open parentheses square root of 16 plus 2 h end root plus square root of 16 close parentheses end fraction close parentheses end cell row blank equals cell limit as h rightwards arrow 0 of open parentheses fraction numerator 2 over denominator open parentheses square root of 16 plus 2 h end root plus square root of 16 close parentheses end fraction close parentheses end cell row blank equals cell fraction numerator 2 over denominator open parentheses square root of 16 plus 2 open parentheses 0 close parentheses end root plus square root of 16 close parentheses end fraction end cell row blank equals cell fraction numerator 2 over denominator open parentheses square root of 16 plus square root of 16 close parentheses end fraction end cell row blank equals cell fraction numerator 2 over denominator 4 plus 4 end fraction end cell row blank equals cell 2 over 8 end cell row blank equals cell 1 fourth end cell row blank blank blank row blank blank blank end table end style

Jadi, turunan begin mathsize 14px style f open parentheses x close parentheses equals square root of 2 x end root end style, pada begin mathsize 14px style x equals 8 end style adalah begin mathsize 14px style 1 fourth end style.

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