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Precalculus
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OpenStudy (anonymous):
Find a ⋅ b. a = 7i - 4j, b = 4i + 3j
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OpenStudy (aroyni):
Hi
OpenStudy (aroyni):
=7*4(i.i)-4*3(j.j)=28-12=16
OpenStudy (aroyni):
does this make sense to you? it's just that i.j=0 and j.i=0
OpenStudy (anonymous):
I figured it out a long time ago, thanks though :)
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