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Diberikan dan , nilai yang mungkin dari a . b adalah ....

Diberikan begin mathsize 14px style open vertical bar a with rightwards arrow on top close vertical bar equals 3 comma space open vertical bar b with rightwards arrow on top close vertical bar equals square root of 7 end style dan Error converting from MathML to accessible text. , nilai yang mungkin dari  adalah ....

  1. {-5, 5}

  2. {-7, 7}

  3. begin mathsize 14px style open curly brackets negative 5 square root of 2 comma 5 square root of 2 close curly brackets end style   

  4. {-5, 7}

  5. {-7, 14}

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

Perhatikan bahwa , berarti , kemudian Dengan menggunakan aturan pada segitiga siku – siku berarti didapat , sehingga

Perhatikan bahwa undefined , berarti begin mathsize 14px style open vertical bar a with rightwards arrow on top cross times b with rightwards arrow on top close vertical bar equals square root of 1 squared plus 2 squared plus 3 squared end root equals square root of 14 end style, kemudian

begin mathsize 14px style open vertical bar a with rightwards arrow on top cross times b with rightwards arrow on top close vertical bar equals square root of 14 open vertical bar a with rightwards arrow on top close vertical bar open vertical bar b with rightwards arrow on top close vertical bar sin space theta equals square root of 14 3 open parentheses square root of 7 close parentheses sin space theta equals square root of 14 sin space theta equals fraction numerator square root of 14 over denominator 3 square root of 7 end fraction equals 1 third square root of 2 end style

Dengan menggunakan aturan pada segitiga siku – siku berarti didapat begin mathsize 14px style cos space theta equals plus-or-minus fraction numerator square root of 7 over denominator 3 end fraction end style , sehingga

begin mathsize 14px style a with rightwards arrow on top. b with rightwards arrow on top equals open vertical bar a with rightwards arrow on top close vertical bar open vertical bar b with rightwards arrow on top close vertical bar cos space theta equals 3 open parentheses square root of 7 close parentheses open parentheses plus-or-minus fraction numerator square root of 7 over denominator 3 end fraction close parentheses equals plus-or-minus 7 end style   

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