Question

please answer this question

Answer 1

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Answer 2

Scalar product:
(5i - 3j).(3i - 5j) = (5×3) + (-3 × -5) = 15 + 15 = 30

Vector product:
(5i - 3j)×(3i - 5j) = (5×(-5))k + (-3 × 3) (-k) = -25k + 9k = -16k