if vector b added to vector a the result is 6i+j. if b is subtracted from a the result is -4i+7j what is the magnitude of vector a&b?
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Explanation:
a + b = 6i+j
a - b = -4i+7j
2a = 2i + 8j , 2b = 10i - 6j
a = i + 4j , b = 5i - 3j
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