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]

Answer Link

Otras preguntas

A new pencil was 18 cm long. Now it measures 12.7 cm. How many centimeters of the pencil have been used?
Reaction formation refers to the process by which people A) disguise unacceptable unconscious impulses by attributing them to others. B) consciously express fe
What began to replace water power in factories?
Fiona and her dad love making paper airplanes. On Saturday morning, Fiona made 12 paper airplanes, and her dad made 8 paper airplanes. That afternoon, they made
Complete the point-slope equation of the line through (-8,-1) and (-6,5) y-5=
What is the best definition of unicameral?
Show all work and explain in words Findthe value of x. Then find the measure of each labeled angle.
Help please 2 questions(25 points)
If a chemical was placed in the water that caused all of the mosquito larvae to die, what would be one possible change in the food chain?A). The number of Algae
What is a scientifically-based theory on finding perimeter?