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Question

|a-b|=

(Simplify your answer. Type an exact answer, using radicals as needed.)

#2

Find |a - b, 3a + b, and 4a-5b.

a = 3i+j+7k, b = 7i+9j-9k

la-bl=

(Simplify your answer. Type an exact answer, using radicals as needed.)

Fig: 1