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Diketahui: f ( x ) = a x 2 + b x + c Tunjukkan bahwa h f ( x + h ) − f ( x ) ​ = 2 a x + ah + b

Diketahui:  Tunjukkan bahwa 

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I. Sutiawan

Master Teacher

Mahasiswa/Alumni Universitas Pasundan

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Pembahasan

Diketahui , maka: Sehingga:

Diketahui f left parenthesis x right parenthesis equals a x squared plus b x plus c, maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x plus h right parenthesis end cell equals cell a left parenthesis x plus h right parenthesis squared plus b left parenthesis x plus h right parenthesis plus c end cell row blank equals cell a left parenthesis x squared plus 2 h x plus h squared right parenthesis plus b x plus b h plus c end cell row blank equals cell a x squared plus 2 a h x plus a h squared plus b x plus b h plus c end cell row blank equals cell a x squared plus 2 a h x plus b x plus a h squared plus b h plus c end cell end table

Sehingga:

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator f left parenthesis x plus h right parenthesis minus f left parenthesis x right parenthesis over denominator h end fraction end cell equals cell 2 a x plus a h plus b end cell row cell fraction numerator a x squared plus 2 a h x plus b x plus a h squared plus b h plus c minus left parenthesis a x squared plus b x plus c right parenthesis over denominator h end fraction end cell equals cell 2 a x plus a h plus b end cell row cell fraction numerator up diagonal strike a x squared end strike plus 2 a h x plus up diagonal strike b x end strike plus a h squared plus b h plus up diagonal strike c minus up diagonal strike a x squared end strike minus up diagonal strike b x end strike minus up diagonal strike c over denominator h end fraction end cell equals cell 2 a x plus a h plus b end cell row cell fraction numerator up diagonal strike h left parenthesis 2 a x plus a h plus b right parenthesis over denominator up diagonal strike h end fraction end cell equals cell 2 a x plus a h plus b end cell row cell 2 a x plus a h plus b end cell equals cell 2 a x plus a h plus b end cell row blank blank cell left parenthesis terbukti right parenthesis end cell end table end style

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