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OpenStudy (anonymous):
Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j
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OpenStudy (anonymous):
<-30, 20>?
OpenStudy (bradely):
Same as do http://www.mathskey.com/question2answer/16283/find-a-%E2%8B%85-b-a-7-4-b-3-5
OpenStudy (crashonce):
so is this your question? (6i+5j)(-5i+4j)
OpenStudy (anonymous):
yes
OpenStudy (crashonce):
so expand
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OpenStudy (bradely):
(6i+5j).(-5i+4j) (6)(-5)+(5)(4)=-30+20=-10
OpenStudy (crashonce):
-30i^2 +10ji-10ji +9j^2
OpenStudy (crashonce):
=-30i^2+9j^2
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