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OpenStudy (anonymous):
given vectors u = 3i + 9j and v = 3i + 4j, find 5u - 9v in terms of unit vectors. My answer: -12i + 9j?
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OpenStudy (whpalmer4):
\[5u -9v = 5(3i+9j) -9(3i+4j) = 15i +45j - 27i -36j = -12i+9j\checkmark\]
OpenStudy (anonymous):
Thank you!
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