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SOVA2 [1]
3 years ago
11

Find a ⋅ b.

Mathematics
2 answers:
MatroZZZ [7]3 years ago
6 0

a.b = 9.5 + (-6).5=15

Colt1911 [192]3 years ago
5 0

Answer:

The correct option is d. 15

Step-by-step explanation:

Consider the provided information.

We need to find the  a ⋅ b

The given vector is:

a = 9i - 6j, b = 5i + 5j

\vec{a} = 9i - 6j \cdot \vec{b}= 5i + 5j

Use the vector multiplication as shown:

a = a_1, a_2,…, a_n\ \text{and}\ b = b_1, b_2,…, b_n is defined as:

a\cdot b =a_1b_1+a_2b_2...a_nb_n

Now by using the above formula:

\vec{a}=9i-6j\cdot \vec{b}= 5i + 5j=45-30=15

Hence, the correct option is d. 15

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