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Jika diketahui ∣ ∣ ​ a ⇀ ∣ ∣ ​ = 2 , ∣ ∣ ​ b ⇀ ∣ ∣ ​ = 1 dan ∣ ∣ ​ a ⇀ − b ⇀ ∣ ∣ ​ = 1 , maka ∣ ∣ ​ a ⇀ + b ⇀ ∣ ∣ ​ = ....

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

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nilai ∣ a ⇀ + b ⇀ ∣ = 3 .

nilai .

Pembahasan

Ingat. ∣ ∣ ​ a ⇀ − b ⇀ ∣ ∣ ​ ​ = ​ ∣ ∣ ​ a ⇀ ∣ ∣ ​ 2 + ∣ ∣ ​ b ⇀ ∣ ∣ ​ 2 − 2 ∣ ∣ ​ a ⇀ ∣ ∣ ​ ∣ ∣ ​ b ⇀ ∣ ∣ ​ cos α ​ ​ ∣ ∣ ​ a ⇀ + b ⇀ ∣ ∣ ​ ​ = ​ ∣ ∣ ​ a ⇀ ∣ ∣ ​ 2 + ∣ ∣ ​ b ⇀ ∣ ∣ ​ 2 + 2 ∣ ∣ ​ a ⇀ ∣ ∣ ​ ∣ ∣ ​ b ⇀ ∣ ∣ ​ cos α ​ ​ Berdasarkan informasi pada soal, dapat diperoleh Akibatnya diperoleh Jadi, nilai ∣ a ⇀ + b ⇀ ∣ = 3 .

Ingat.

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Berdasarkan informasi pada soal, dapat diperoleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar a with rightwards harpoon with barb upwards on top minus b with rightwards harpoon with barb upwards on top close vertical bar end cell equals cell square root of open vertical bar a with rightwards harpoon with barb upwards on top close vertical bar squared plus open vertical bar b with rightwards harpoon with barb upwards on top close vertical bar squared minus 2 open vertical bar a with rightwards harpoon with barb upwards on top close vertical bar open vertical bar b with rightwards harpoon with barb upwards on top close vertical bar cos alpha end root end cell row 1 equals cell square root of 2 squared plus 1 squared minus open parentheses 2 cross times 2 cross times 1 cross times cos alpha close parentheses end root end cell row 1 equals cell square root of 4 plus 1 minus 4 cos alpha end root end cell row 1 equals cell square root of 5 minus 4 cos alpha end root end cell row cell 1 squared end cell equals cell open parentheses square root of 5 minus 4 cos alpha end root close parentheses squared end cell row 1 equals cell 5 minus 4 cos alpha end cell row cell 4 cos alpha end cell equals cell 5 minus 1 end cell row cell 4 cos alpha end cell equals 4 row cell cos alpha end cell equals 1 end table end style

Akibatnya diperoleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top close vertical bar end cell equals cell square root of open vertical bar a with rightwards harpoon with barb upwards on top close vertical bar squared plus open vertical bar b with rightwards harpoon with barb upwards on top close vertical bar squared plus 2 open vertical bar a with rightwards harpoon with barb upwards on top close vertical bar open vertical bar b with rightwards harpoon with barb upwards on top close vertical bar cos alpha end root end cell row blank equals cell square root of 2 squared plus 1 squared plus open parentheses 2 cross times 2 cross times 1 cross times 1 close parentheses end root end cell row blank equals cell square root of 4 plus 1 plus 4 end root end cell row blank equals cell square root of 9 end cell row blank equals 3 end table end style

Jadi, nilai .

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