courtr51 courtr51

24-08-2016
Mathematics

contestada

Find a • b.

a = 4i + 3j, b = -4i + 4j

Respuesta :

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]

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