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Diketahui ∣ ∣ ​ a ∣ ∣ ​ = 2 , ∣ ∣ ​ b ∣ ∣ ​ = 5 dan sudut antara a dan b adalah 6 0 ∘ , maka proyeksi skalar vektor a + b pada vektor adalah ....

Diketahui  dan sudut antara  dan  adalah , maka proyeksi skalar vektor pada vektor straight b with rightwards arrow on top adalah ....

  1. 8

  2. 6

  3. 5

  4. 3

  5. 2

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S. Eka

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

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Pembahasan

Menggunakan rumus dot product dua vektor: Maka proyeksi skalar vektor + pada vektor

Menggunakan rumus dot product dua vektor:
straight a with rightwards arrow on top straight b with rightwards arrow on top equals open vertical bar straight a with rightwards arrow on top close vertical bar times open vertical bar straight b with rightwards arrow on top close vertical bar times cos open parentheses straight a with rightwards arrow on top comma straight b with rightwards harpoon with barb upwards on top close parentheses left right double arrow straight a with rightwards arrow on top straight b with rightwards arrow on top equals 2 times 5 times cos space 60 degree straight a with rightwards arrow on top straight b with rightwards arrow on top equals 2 times 5 times 1 half rightwards double arrow straight a with rightwards arrow on top straight b with rightwards arrow on top equals 5 
Maka proyeksi skalar vektor  straight a with rightwards arrow on top+ straight b with rightwards arrow on top  pada vektor  straight b with rightwards arrow on top equals fraction numerator open parentheses straight a with rightwards arrow on top plus space straight b with rightwards arrow on top close parentheses straight b with rightwards arrow on top over denominator open vertical bar straight b with rightwards arrow on top close vertical bar end fraction equals fraction numerator open parentheses straight a with rightwards arrow on top straight b with rightwards arrow on top close parentheses space plus straight b with rightwards arrow 2 on top over denominator open vertical bar straight b with rightwards arrow on top close vertical bar end fraction equals fraction numerator open parentheses straight a with rightwards arrow on top straight b with rightwards arrow on top close parentheses space plus open vertical bar straight b with rightwards arrow 2 on top close vertical bar over denominator open vertical bar straight b with rightwards arrow on top close vertical bar end fraction equals fraction numerator 5 plus 25 over denominator 5 end fraction equals 6

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Marcella Zieletta Girsang

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Jika x 1 ​ dan x 2 ​ adalah penyelesaian persamaan , maka x 1 ​ x 2 ​ = ....

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