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Rama09 [41]
4 years ago
11

Please help me Find a • b. a = 5i + 7j, b = -4i + 3j

Mathematics
1 answer:
Charra [1.4K]4 years ago
8 0
\bf \begin{cases}
a=5i+7j\implies &\ \textless \ 5,7\ \textgreater \ \\
b=-4i+3j\implies &\ \textless \ -4,3\ \textgreater \ 
\end{cases}
\\\\\\
\ \textless \ 5,7\ \textgreater \ \cdot \ \textless \ -4,3\ \textgreater \ \implies (5\cdot -4)+(7\cdot 3)\implies -20+21\implies 1
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