if a=3i -4J ,B=5i+2j find 2a+3b and |2a+3b|
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Answer:
Answer: 21i + 2j
Step-by-step explanation:
1) Since a=3i -4J, 2a= 2(3i-4j)= 6i-8j
Also, since B= 5i+2j, 3B= 3(5i+2j)= 15i+6j
=> 2a+3b = (6i-8j)+(15i+6j)
=> 6i-8j+15i+6j
=> 21i-2j
2) 21i-2j
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