Find

Question

a + b, 2a + 3b, |a|, and |a − b|.
a = 2i + j, b = i − 5j

Answer 1

a+b = 2i+j + i-5j = 3i - 4j
do 2a + 3b the same way

|a| = √(2^2 + 1^2) = √5

for |a-b| , find a-b first then take the magnitude using your formula