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Diketahui 3 x 2 + 4 x − 7 jika garis singgung kurva dititik (a,b) tegak lurus garis 2 x + y − 8 = 0 , Maka tentukan persamaan garis singgung tersebut

Diketahui jika garis singgung kurva dititik (a,b) tegak lurus garis , Maka tentukan persamaan garis singgung tersebut

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B. Hary

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Karena tegak lurus Mencari nilai x dan y Jadi, persamaan garis singgung yang melalui titik dan adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell straight f left parenthesis straight x right parenthesis end cell equals cell 3 straight x squared plus 4 straight x minus 7 end cell row cell straight y apostrophe end cell equals cell 6 straight x plus 4 end cell row blank blank blank end table

Karena tegak lurus

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 straight x plus straight y minus 8 end cell equals 0 row straight y equals cell negative 2 straight x plus 8 end cell row cell straight m subscript 2 end cell equals cell negative 2 end cell row cell straight m subscript 1 cross times straight m subscript 2 end cell equals cell negative 1 end cell row cell straight m subscript 1 end cell equals cell negative 1 cross times negative 1 half end cell row blank equals cell 1 half end cell row blank blank blank end table

Mencari nilai x dan y

table attributes columnalign right center left columnspacing 0px end attributes row cell straight m subscript 1 end cell equals cell 6 straight x plus 4 end cell row cell 1 half end cell equals cell 6 straight x plus 4 end cell row cell 1 half minus 4 end cell equals cell 6 straight x end cell row cell fraction numerator 1 minus 8 over denominator 2 end fraction end cell equals cell 6 straight x end cell row cell fraction numerator negative 7 over denominator 2 end fraction end cell equals cell 6 straight x end cell row cell fraction numerator negative 7 over denominator 2 end fraction cross times 1 over 6 end cell equals straight x row cell negative 7 over 12 end cell equals straight x row straight y equals cell negative 2 straight x plus 8 end cell row straight y equals cell negative 2 cross times fraction numerator negative 7 over denominator 12 end fraction plus 8 end cell row blank equals cell 14 over 12 plus 8 end cell row blank equals cell 7 over 6 plus 8 end cell row blank equals cell fraction numerator 7 plus 48 over denominator 6 end fraction end cell row blank equals cell 55 over 6 end cell row blank blank blank row blank blank blank end table

Jadi, persamaan garis singgung yang melalui titik table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open parentheses fraction numerator negative 7 over denominator 12 end fraction comma 55 over 6 close parentheses end cell end table dan table attributes columnalign right center left columnspacing 0px end attributes row cell straight m subscript 2 end cell equals cell 1 half space end cell end tableadalah

table attributes columnalign right center left columnspacing 0px end attributes row cell straight y minus straight y subscript 1 end cell equals cell straight m subscript 2 open parentheses straight x minus straight x subscript 1 close parentheses end cell row cell straight y minus 55 over 6 end cell equals cell 1 half open parentheses straight x minus open parentheses negative 7 over 12 close parentheses close parentheses end cell row cell straight y minus 55 over 6 end cell equals cell 1 half straight x plus 7 over 24 end cell row straight y equals cell 1 half straight x plus 7 over 24 plus 55 over 6 end cell row straight y equals cell 1 half straight x plus 227 over 24 end cell end table

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