courtr51
courtr51
24-08-2016
Mathematics
contestada
Find a • b.
a = 4i + 3j, b = -4i + 4j
Respuesta :
caylus
caylus
24-08-2016
Hello,
I suppose a and b are vectors
and i and j unit's vectors
[tex]\vec{i}*\vec{i}=1\\ \vec{j}*\vec{j}=1\\ \vec{i}*\vec{j}=0\\ [/tex]
[tex]\vec{a}\ .\ \vec{b}=(4\vec{i}\ +3 \vec{j}).(-4\vec{i}\ +4 \vec{j})\\ =-16-3*4*0+4*4*0+12=-4[/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 93+ )
Otras preguntas
Which of the following best describes the difference between a mixture and a pure substance?
Please help I don't know what to do for number 40
a giraffe can run about 14 meters per second find its speed in miles per hour
Graph the linear equation solve for Y 3x+y=6
The combination of units written kg·m/s2 can be used for which of the following? A. acceleration B. mass C. force D. weight
Which of the following elements is not necessary to prevent value conflicts in the work place? A. ToleranceB. ConsiderationC. AvoidanceD. Honest communication
If there are 400 cubic centimeters of a chemical in 1 liter of solution, how many cubic centimeters of water must be added to dilute it to a 25% solution?
Find k such that x² + (k + 1)x + k + 4 = 0
What is an ion? in chemistry
Janes quiz scores: 82 64 73 91 85 what is the mean ?
