The sum of the vectors given is -i
Vectors consists of y and x axis. They are plotted on an xy plane known as the argand diagram.
Given the following vectors
u = 3i - 8j
v = -4i + 8j
Take the sum of the vectors
u + v = (3i - 8j) + (-4i + 8j)
Take the sum to have
u + v = (3i-4i)+(-8j+8j)
u + v = -I
Hence the sum of the vectors given is -i
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