Respuesta :

3v - 4w
3(3i-5j) - 4(-7i+4j)
= (9i-15j) - (-28i+16j)
Part 1) 9i - - 28i = 9i + 28i = 37i
Part 2) -15j - 16j = -31j

Answer: 37i - 31j

The value of 3v – 4w​ = 37i - 31j

v = 3i - 5j

w = -7i + 4j

Therefore,

3v - 4w = 3(3i - 5j) - 4( -7i + 4j)

3v - 4w = 9i - 15j + 28i - 16j

combine like terms

9i - 15j + 28i - 16j

9i + 28i - 15j - 16j

37i - 31j

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