Find a • b. a = 4i + 8j, b = -2i + 3j <2, 11> 32 <-8, 24> 16

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asked Jul 10, 2019 55.7k views

4 votes

Find a • b.

a = 4i + 8j, b = -2i + 3j

<2, 11>
32
<-8, 24>
16

Mathematics
middle-school

Cucucool asked

by Cucucool

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1 Answer

7 votes

That is about coordinates and the dot product
we have a has coordinates (4;8)
and b has coordinates (-2;3)
So we have a.b= 4x(-2)+ 8x3= -8+24=16
The answer is 16

Annemarie answered Jul 14, 2019

by Annemarie

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