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Diketahui vektor a = i − x j ​ + 3 k , b = 2 i + j ​ − k dan c = i + 3 j ​ + 2 k . Jika a tegak lurus vektor b , maka hasil dari 2 a . ( b − c ) adalah ....

Diketahui vektor  dan . Jika  tegak lurus vektor , maka hasil dari  adalah ....

  1. -20

  2. -12

  3. -10

  4. -8

  5. -1

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Diketahui vektor dan Jika , maka: maka hasil dari adalah :

Diketahui vektor begin mathsize 14px style straight a with rightwards arrow on top equals straight i with rightwards arrow on top minus straight x straight j with rightwards arrow on top plus 3 straight k with rightwards arrow on top comma space straight b with rightwards arrow on top equals 2 straight i with rightwards arrow on top plus straight j with rightwards arrow on top minus straight k with rightwards arrow on top end style dan begin mathsize 14px style straight c with rightwards arrow on top equals straight i with rightwards arrow on top plus 3 straight j with rightwards arrow on top plus 2 straight k with rightwards arrow on top end style

Jika begin mathsize 14px style straight a with rightwards arrow on top perpendicular straight b with rightwards arrow on top end style, maka:

begin mathsize 14px style straight a with rightwards arrow on top space. space straight b with rightwards arrow on top equals 0 rightwards arrow open parentheses table row 1 row cell negative straight x end cell row 3 end table close parentheses space. space open parentheses table row 2 row 1 row cell negative 1 end cell end table close parentheses equals 0 2 minus straight x minus 3 equals 0 minus straight x minus 1 equals 0 straight x equals negative 1 end style 

maka hasil dari undefined adalah :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 straight a with rightwards arrow on top space. space open parentheses straight b with rightwards arrow on top minus straight c with rightwards arrow on top close parentheses end cell equals cell 2 open parentheses table row 1 row 1 row 3 end table close parentheses space. space open square brackets open parentheses table row 2 row 1 row cell negative 1 end cell end table close parentheses minus open parentheses table row 1 row 3 row 2 end table close parentheses close square brackets equals open parentheses table row 2 row 2 row 6 end table close parentheses space. space open parentheses table row 1 row cell negative 2 end cell row cell negative 3 end cell end table close parentheses end cell row blank equals cell 2 minus 4 minus 18 end cell row blank equals cell negative 20 end cell end table end style 

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