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Tentukan titik potong- x dan titik potong- y dari fungsi-fungsi berikut: b. x 2 + y 2 − 8 x − 6 y − 11 = 0

Tentukan titik potong- dan titik potong- dari fungsi-fungsi berikut:

b. 

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

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titik potong- pada adalah atau .

titik potong-y pada x squared plus y squared minus 8 x minus 6 y minus 11 equals 0 adalah left parenthesis 0 comma space 3 plus 2 square root of 5 right parenthesis atau .left parenthesis 0 comma space 3 minus 2 square root of 5 right parenthesis

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Akan ditentukan titik potong- , artinya Perhatikan persamaan berikut. maka atau Jadi titik potong- pada adalah . Akan ditentukan titik potong- , artinya Perhatikan persamaan berikut. maka atau Jadi titik potong- pada adalah atau .

Akan ditentukan titik potong-x, artinya y equals 0

Perhatikan persamaan berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell x squared plus y squared minus 8 x minus 6 y minus 11 end cell equals 0 row cell x squared plus left parenthesis 0 right parenthesis squared minus 8 x minus 6 left parenthesis 0 right parenthesis minus 11 end cell equals 0 row cell x squared plus 0 minus 8 x minus 0 minus 11 end cell equals 0 row cell x squared minus 8 x minus 11 end cell equals 0 end table 

maka

table attributes columnalign right center left columnspacing 0px end attributes row cell x subscript 1 end cell equals cell fraction numerator negative b plus square root of b squared minus 4 a c end root over denominator 2 a end fraction end cell row blank equals cell fraction numerator negative left parenthesis negative 8 right parenthesis plus square root of left parenthesis negative 8 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis negative 11 right parenthesis end root over denominator 2 left parenthesis 1 right parenthesis end fraction end cell row blank equals cell fraction numerator 8 plus square root of 64 plus 44 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 8 plus square root of 108 over denominator 2 end fraction end cell row blank equals cell fraction numerator 8 plus square root of 36 cross times 3 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 8 plus 6 square root of 3 over denominator 2 end fraction end cell row blank equals cell 4 plus 3 square root of 3 end cell end table  

atau

table attributes columnalign right center left columnspacing 0px end attributes row cell x subscript 2 end cell equals cell fraction numerator negative b minus square root of b squared minus 4 a c end root over denominator 2 a end fraction end cell row blank equals cell fraction numerator negative left parenthesis negative 8 right parenthesis minus square root of left parenthesis negative 8 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis negative 11 right parenthesis end root over denominator 2 left parenthesis 1 right parenthesis end fraction end cell row blank equals cell fraction numerator 8 minus square root of 64 plus 44 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 8 minus square root of 108 over denominator 2 end fraction end cell row blank equals cell fraction numerator 8 minus square root of 36 cross times 3 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 8 minus 6 square root of 3 over denominator 2 end fraction end cell row blank equals cell 4 minus 3 square root of 3 end cell end table 

Jadi titik potong-x pada x squared plus y squared minus 8 x minus 6 y minus 11 equals 0 adalah left parenthesis 4 plus 3 square root of 3 comma space 0 right parenthesis space atau space open parentheses 4 minus 3 square root of 3 comma space 0 close parentheses.

Akan ditentukan titik potong-y, artinya x equals 0

Perhatikan persamaan berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell x squared plus y squared minus 8 x minus 6 y minus 11 end cell equals 0 row cell left parenthesis 0 right parenthesis squared plus y squared minus 8 left parenthesis 0 right parenthesis minus 6 y minus 11 end cell equals 0 row cell 0 plus y squared minus 0 minus 6 y minus 11 end cell equals 0 row cell y squared minus 6 y minus 11 end cell equals 0 end table 

maka

table attributes columnalign right center left columnspacing 0px end attributes row cell y subscript 1 end cell equals cell fraction numerator negative b plus square root of b squared minus 4 a c end root over denominator 2 a end fraction end cell row blank equals cell fraction numerator negative left parenthesis negative 6 right parenthesis plus square root of left parenthesis negative 6 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis negative 11 right parenthesis end root over denominator 2 left parenthesis 1 right parenthesis end fraction end cell row blank equals cell fraction numerator 6 plus square root of 36 plus 44 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 6 plus square root of 80 over denominator 2 end fraction end cell row blank equals cell fraction numerator 6 plus square root of 16 cross times 5 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 6 plus 4 square root of 5 over denominator 2 end fraction end cell row blank equals cell 3 plus 2 square root of 5 end cell end table 

atau

table attributes columnalign right center left columnspacing 0px end attributes row cell y subscript 2 end cell equals cell fraction numerator negative b minus square root of b squared minus 4 a c end root over denominator 2 a end fraction end cell row blank equals cell fraction numerator negative left parenthesis negative 6 right parenthesis minus square root of left parenthesis negative 6 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis negative 11 right parenthesis end root over denominator 2 left parenthesis 1 right parenthesis end fraction end cell row blank equals cell fraction numerator 6 minus square root of 36 plus 44 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 6 minus square root of 80 over denominator 2 end fraction end cell row blank equals cell fraction numerator 6 minus square root of 16 cross times 5 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator 6 minus 4 square root of 5 over denominator 2 end fraction end cell row blank equals cell 3 minus 2 square root of 5 end cell end table

Jadi titik potong-y pada x squared plus y squared minus 8 x minus 6 y minus 11 equals 0 adalah left parenthesis 0 comma space 3 plus 2 square root of 5 right parenthesis atau .left parenthesis 0 comma space 3 minus 2 square root of 5 right parenthesis

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