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Mathematics 10 Online
OpenStudy (anonymous):

Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j 50 <1, 9> -10 <-30, 20>

OpenStudy (anonymous):

I thought i knew what i was doing but clearly i didnt.. i put D and was wrong .. please help?

OpenStudy (alekos):

a . b = a1b1 + a2b2

OpenStudy (alekos):

a = a1i + a2j and b = b1i + b2j

OpenStudy (anonymous):

so then it would be 6(-5)+5(4) -30+20 -10

OpenStudy (dumbcow):

correct :)

OpenStudy (alekos):

you got it!

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