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Diketahui a ⇀ = ⎝ ⎛ ​ 2 0 1 ​ ⎠ ⎞ ​ , b ⇀ = ⎝ ⎛ ​ 1 3 − 1 ​ ⎠ ⎞ ​ dan c ⇀ = ⎝ ⎛ ​ − 5 − 1 1 ​ ⎠ ⎞ ​ . Tentukan vektor satuan yang searah dengan 2 a ⇀ + b ⇀ + c ⇀ .

Diketahui  dan . Tentukan vektor satuan yang searah dengan 

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

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vektor satuan yang searah dengan adalah .

vektor satuan yang searah dengan begin mathsize 14px style 2 a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top plus c with rightwards harpoon with barb upwards on top end style adalah  table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank cell open parentheses table row 0 row cell 1 half square root of 2 end cell row cell 1 half square root of 2 end cell end table close parentheses end cell end table.

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Pembahasan

Perhatikan Jadi, vektor satuan yang searah dengan adalah .

Perhatikan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top plus c with rightwards harpoon with barb upwards on top end cell equals cell 2 open parentheses table row 2 row 0 row 1 end table close parentheses plus open parentheses table row 1 row 3 row cell negative 1 end cell end table close parentheses plus open parentheses table row cell negative 5 end cell row cell negative 1 end cell row 1 end table close parentheses end cell row blank equals cell open parentheses table row 4 row 0 row 2 end table close parentheses plus open parentheses table row 1 row 3 row cell negative 1 end cell end table close parentheses plus open parentheses table row cell negative 5 end cell row cell negative 1 end cell row 1 end table close parentheses end cell row blank equals cell open parentheses table row 0 row 2 row 2 end table close parentheses end cell row cell open vertical bar 2 a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top plus c with rightwards harpoon with barb upwards on top close vertical bar end cell equals cell 2 square root of 2 end cell row cell stack 2 a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top plus c with rightwards harpoon with barb upwards on top with hat on top end cell equals cell fraction numerator open parentheses table row 0 row 2 row 2 end table close parentheses over denominator 2 square root of 2 end fraction end cell row blank equals cell open parentheses table row 0 row cell 1 half square root of 2 end cell row cell 1 half square root of 2 end cell end table close parentheses end cell end table end style

Jadi, vektor satuan yang searah dengan begin mathsize 14px style 2 a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top plus c with rightwards harpoon with barb upwards on top end style adalah  table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank cell open parentheses table row 0 row cell 1 half square root of 2 end cell row cell 1 half square root of 2 end cell end table close parentheses end cell end table.

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Luthfiah Zahra

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