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Titik A(-2,2) ditransformasi oleh matriks kemudian dilanjutkan rotasi sejauh 45° berlawanan arah jarum jam dengan pusat O(0,0) maka bayangan titik A adalah ….

Titik A(-2,2) ditransformasi oleh matriks begin mathsize 14px style open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses to the power of 42 end style kemudian dilanjutkan rotasi sejauh 45° berlawanan arah jarum jam dengan pusat O(0,0) maka bayangan titik A adalah ….

  1. begin mathsize 14px style open parentheses 2 square root of 2 comma 0 close parentheses end style 

  2. Error converting from MathML to accessible text. 

  3. begin mathsize 14px style open parentheses negative 2 square root of 2 comma 2 square root of 2 close parentheses end style 

  4. begin mathsize 14px style open parentheses negative square root of 2 comma square root of 2 close parentheses end style 

  5. begin mathsize 14px style open parentheses negative 2 square root of 2 comma 0 close parentheses end style 

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Y. Laksmi

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

hasil transformasinya adalah .

hasil transformasinya adalah begin mathsize 14px style open parentheses negative 2 square root of 2 comma 0 close parentheses end style.

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Pembahasan

Matriks transformasi pertama yaitu : Matriks transformasi kedua yaitu matriks rotasi sejauh 45° dengan pusat (0,0): Ingat kembali bahwa IA = A, A adalah sebuah matriks Maka, Sehingga, Jadi hasil transformasinya adalah .

Error converting from MathML to accessible text.

Matriks transformasi pertama yaitu :

begin mathsize 14px style straight M subscript 1 equals open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses to the power of 42 end style

Matriks transformasi kedua yaitu matriks rotasi sejauh 45° dengan pusat (0,0):

begin mathsize 14px style straight M subscript 2 equals open parentheses table row cell cos invisible function application 45 to the power of o end cell cell negative sin invisible function application 45 to the power of o end cell row cell sin invisible function application 45 to the power of o end cell cell cos invisible function application 45 to the power of o end cell end table close parentheses straight M subscript 2 equals open parentheses table row cell 1 half square root of 2 end cell cell negative 1 half square root of 2 end cell row cell 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses end style

Ingat kembali bahwa 

undefined
IA = A, A adalah sebuah matriks
undefined

Maka,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight M equals cell open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses end cell row cell straight M squared end cell equals cell open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses squared end cell row blank equals cell open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses end cell row blank equals cell open parentheses table row cell negative 1 end cell 0 row 0 cell negative 1 end cell end table close parentheses end cell row blank equals cell negative open parentheses table row 1 0 row 0 1 end table close parentheses end cell row cell open square brackets straight M squared close square brackets to the power of 21 end cell equals cell open square brackets negative open parentheses table row 1 0 row 0 1 end table close parentheses close square brackets to the power of 21 equals negative open parentheses table row 1 0 row 0 1 end table close parentheses end cell end table end style

Sehingga,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight A to the power of double apostrophe end cell equals cell straight M subscript 2 times straight M subscript 1 times straight A end cell row cell open parentheses table row cell straight x to the power of double apostrophe end cell row cell straight y double apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell 1 half square root of 2 end cell cell negative 1 half square root of 2 end cell row cell 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses open parentheses table row 0 1 row cell negative 1 end cell 0 end table close parentheses to the power of 42 open parentheses table row straight x row straight y end table close parentheses end cell row cell open parentheses table row cell straight x to the power of double apostrophe end cell row cell straight y double apostrophe end cell end table close parentheses end cell equals cell negative open parentheses table row cell 1 half square root of 2 end cell cell negative 1 half square root of 2 end cell row cell 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses open parentheses table row 1 0 row 0 1 end table close parentheses open parentheses table row cell negative 2 end cell row 2 end table close parentheses end cell row cell open parentheses table row cell straight x to the power of double apostrophe end cell row cell straight y double apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell 1 half square root of 2 end cell cell negative 1 half square root of 2 end cell row cell 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses open parentheses table row cell negative 2 end cell row 2 end table close parentheses end cell row cell open parentheses table row cell straight x to the power of double apostrophe end cell row cell straight y double apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative square root of 2 minus square root of 2 end cell row cell negative square root of 2 plus square root of 2 end cell end table close parentheses end cell row cell open parentheses table row cell straight x to the power of double apostrophe end cell row cell straight y double apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 2 square root of 2 end cell row 0 end table close parentheses end cell end table end style

Jadi hasil transformasinya adalah begin mathsize 14px style open parentheses negative 2 square root of 2 comma 0 close parentheses end style.

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