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

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

User Mrchance
by
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1 Answer

6 votes

Answer:


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

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

User Re Captcha
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