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OpenStudy (anonymous):
Find a ⋅ b. a = 4i - 4j, b = 4i + 5j
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OpenStudy (anonymous):
a.b means scalar product (4i-4j).(4i+5j)=16i.i-20j.j(all i.j or j.i are zero)=-4(i.i=j.j=1)
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