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Pertanyaan

Diketahui θ merupakan sudut yang dibentuk oleh vektor a dan b , dengan dan . Jika cos θ = 19 5 ​ , maka p² = ....

Diketahui θ merupakan sudut yang dibentuk oleh vektor , dengan begin mathsize 14px style straight a with rightwards arrow on top equals open parentheses 1 comma straight p plus 1 comma straight p minus 1 close parentheses end style  dan Error converting from MathML to accessible text.. Jika , maka p² =  ....

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  2. 4

  3. 8

  4. 16

  5. 25

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

Pembahasan

Ingat bahwa Karena dan , maka : Kemudian dan Karena , maka : Jadi, jawaban yang tepat adalah C.

Ingat bahwa 

begin mathsize 14px style straight a with rightwards arrow on top times straight b with rightwards arrow on top equals open vertical bar straight a with rightwards arrow on top close vertical bar open vertical bar straight b with rightwards arrow on top close vertical bar cos invisible function application straight theta end style 

Karena undefined dan undefined, maka :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top times straight b with rightwards arrow on top end cell equals cell 1 open parentheses negative 1 close parentheses plus open parentheses straight p plus 1 close parentheses open parentheses 3 close parentheses plus open parentheses straight p minus 1 close parentheses open parentheses negative 3 close parentheses end cell row blank equals cell negative 1 plus 3 straight p plus 3 minus 3 straight p plus 3 end cell row blank equals 5 end table end style 

 Kemudian

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight a with rightwards arrow on top close vertical bar end cell equals cell square root of 1 squared plus open parentheses straight p plus 1 close parentheses squared plus open parentheses straight p minus 1 close parentheses squared end root end cell row blank equals cell square root of 1 plus open parentheses straight p squared plus 2 straight p plus 1 close parentheses plus open parentheses straight p squared minus 2 straight p plus 1 close parentheses end root end cell row blank equals cell square root of 2 straight p squared plus 3 end root end cell end table end style 

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight b with rightwards arrow on top close vertical bar end cell equals cell square root of open parentheses negative 1 close parentheses squared plus 3 squared plus open parentheses negative 3 close parentheses squared end root end cell row blank equals cell square root of 1 plus 9 plus 9 end root end cell row blank equals cell square root of 19 end cell end table end style 

Karena undefined, maka :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top times straight b with rightwards arrow on top end cell equals cell open vertical bar straight a with rightwards arrow on top close vertical bar open vertical bar straight b with rightwards arrow on top close vertical bar cos invisible function application straight theta end cell row 5 equals cell square root of 2 straight p squared plus 3 end root times square root of 19 times 5 over 19 end cell row 1 equals cell square root of 2 straight p squared plus 3 end root times square root of 19 times 1 over 19 end cell row 1 equals cell square root of 2 straight p squared plus 3 end root times fraction numerator 1 over denominator square root of 19 end fraction end cell row cell square root of 19 end cell equals cell square root of 2 straight p squared plus 3 end root end cell row 19 equals cell 2 straight p squared plus 3 end cell row cell 2 straight p squared end cell equals 16 row cell straight p squared end cell equals 8 end table end style 

Jadi, jawaban yang tepat adalah C.

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