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Jika a = 2 i − 4 j ​ merupakan invers dari vektor b , maka tentukan vektor satuan dari !

Jika  merupakan invers dari vektor , maka tentukan vektor satuan dari undefined!

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Jika merupakan invers dari vektor , maka: Sehingga vektor satuan dari :

Jika begin mathsize 14px style a with rightwards arrow on top equals 2 i with rightwards arrow on top minus 4 j with rightwards arrow on top end style merupakan invers dari vektor begin mathsize 14px style b with rightwards arrow on top end style, maka:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards harpoon with barb upwards on top end cell equals cell open parentheses table row 2 row cell negative 4 end cell end table close parentheses end cell row cell b with rightwards arrow on top end cell equals cell negative a with rightwards arrow on top end cell row cell b with rightwards harpoon with barb upwards on top end cell equals cell negative open parentheses table row 2 row cell negative 4 end cell end table close parentheses end cell row cell b with rightwards harpoon with barb upwards on top end cell equals cell open parentheses table row cell negative 2 end cell row 4 end table close parentheses end cell end table end style

Sehingga vektor satuan dari begin mathsize 14px style b with rightwards arrow on top end style:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell e subscript b with rightwards arrow on top end subscript end cell equals cell fraction numerator 1 over denominator open vertical bar b with rightwards arrow on top close vertical bar end fraction times b with rightwards arrow on top end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell fraction numerator 1 over denominator square root of open parentheses negative 2 close parentheses squared plus open parentheses 4 close parentheses squared end root end fraction times open parentheses table row cell negative 2 end cell row 4 end table close parentheses end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell fraction numerator 1 over denominator square root of 4 plus 16 end root end fraction times open parentheses table row cell negative 2 end cell row 4 end table close parentheses end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell fraction numerator 1 over denominator square root of 20 end fraction times open parentheses table row cell negative 2 end cell row 4 end table close parentheses end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell fraction numerator 1 over denominator 2 square root of 5 end fraction cross times fraction numerator square root of 5 over denominator square root of 5 end fraction times open parentheses table row cell negative 2 end cell row 4 end table close parentheses end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell 1 over 10 square root of 5 times open parentheses table row cell negative 2 end cell row 4 end table close parentheses end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell open parentheses table row cell negative 2 over 10 square root of 5 end cell row cell 4 over 10 square root of 5 end cell end table close parentheses end cell row cell e subscript b with rightwards arrow on top end subscript end cell equals cell open parentheses table row cell negative 1 fifth square root of 5 end cell row cell 2 over 5 square root of 5 end cell end table close parentheses end cell end table end style

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