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Masja [62]
3 years ago
10

Find a • b. a = 5i + 7j, b = -4i + 3j 1 41

Mathematics
1 answer:
topjm [15]3 years ago
3 0

Answer:

\boxed{-20i^2 -13ij+21j^2}

Step-by-step explanation:

\sf Plug \ in \ the \ values.

(5i+7j) \cdot (-4i+3j)

\sf Expand \ brackets.

5i(-4i+3j)+7j(-4i+3j)

-20i^2 +15ij+-28ij +21j^2

\sf Combine \ like \ terms.

-20i^2 -13ij+21j^2

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Hello!

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I hope this helps!
4 0
3 years ago
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Answer:

<em>Answer</em><em> </em><em>is</em><em> </em><em>-6</em>

Step-by-step explanation:

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6 0
3 years ago
Mr. Vella can build a brick wall in 4 days. His apprentice can build the same wall in 6 days. After working alone for 3 days, Mr
Vitek1552 [10]
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Step-by-step explanation:

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