courtr51
courtr51
24-08-2016
Mathematics
contestada
Find a • b.
a = 4i + 3j, b = -4i + 4j
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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]
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