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Jika u = ⎝ ⎛ ​ 3 n 1 ​ ⎠ ⎞ ​ dan v = ⎝ ⎛ ​ 2 2 − 4 ​ ⎠ ⎞ ​ serta panjang komponen proyeksi ortogonal u pada v adalah 6 ​ , maka ∣ ∣ ​ u + v ∣ ∣ ​ adalah...

Jika  dan  serta panjang komponen proyeksi ortogonal  pada  adalah  , maka  adalah...

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S. Dwi

Master Teacher

Jawaban terverifikasi

Jawaban

nilai adalah .

nilai open vertical bar u with rightwards arrow on top plus v with rightwards arrow on top close vertical bar adalah square root of 83.

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Diketahui Maka Sehingga Dengan demikian nilai adalah .

Diketahui

table attributes columnalign right center left columnspacing 0px end attributes row cell u with rightwards harpoon with barb upwards on top end cell equals cell open parentheses table row 3 row n row 1 end table close parentheses end cell row cell v with rightwards arrow on top end cell equals cell open parentheses table row 2 row 2 row cell negative 4 end cell end table close parentheses end cell end table

Maka

table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator u with rightwards arrow on top times v with rightwards arrow on top over denominator open vertical bar v with rightwards arrow on top close vertical bar end fraction end cell equals cell square root of 6 end cell row cell fraction numerator open parentheses table row 3 row n row 1 end table close parentheses times open parentheses table row 2 row 2 row cell negative 4 end cell end table close parentheses over denominator square root of 2 squared plus 2 squared plus open parentheses negative 4 close parentheses squared end root end fraction end cell equals cell square root of 6 end cell row cell fraction numerator 6 plus 2 n minus 4 over denominator square root of 24 end fraction end cell equals cell square root of 6 end cell row cell 2 n plus 2 end cell equals cell square root of 144 end cell row cell 2 n end cell equals cell 12 minus 2 end cell row n equals cell 10 over 2 end cell row n equals 5 end table

Sehingga 

table attributes columnalign right center left columnspacing 0px end attributes row cell u with rightwards arrow on top plus v with rightwards arrow on top end cell equals cell open parentheses table row 3 row 5 row 1 end table close parentheses plus open parentheses table row 2 row 2 row cell negative 4 end cell end table close parentheses equals open parentheses table row 5 row 7 row cell negative 3 end cell end table close parentheses end cell row cell open vertical bar u with rightwards arrow on top plus v with rightwards arrow on top close vertical bar end cell equals cell square root of 5 squared plus 7 squared plus open parentheses negative 3 close parentheses squared end root end cell row blank equals cell square root of 25 plus 49 plus 9 end root end cell row blank equals cell square root of 83 end cell end table

Dengan demikian nilai open vertical bar u with rightwards arrow on top plus v with rightwards arrow on top close vertical bar adalah square root of 83.

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