kavyaadusumilli23 kavyaadusumilli23
  • 03-08-2020
  • Mathematics
contestada

Find a • b. a = 5i + 7j, b = -4i + 3j 1 41

Respuesta :

09pqr4sT
09pqr4sT 09pqr4sT
  • 03-08-2020

Answer:

[tex]\boxed{-20i^2 -13ij+21j^2}[/tex]

Step-by-step explanation:

[tex]\sf Plug \ in \ the \ values.[/tex]

[tex](5i+7j) \cdot (-4i+3j)[/tex]

[tex]\sf Expand \ brackets.[/tex]

[tex]5i(-4i+3j)+7j(-4i+3j)[/tex]

[tex]-20i^2 +15ij+-28ij +21j^2[/tex]

[tex]\sf Combine \ like \ terms.[/tex]

[tex]-20i^2 -13ij+21j^2[/tex]

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