Answer:
-39
Explanation:
||u|| = sqrt(5² + (-12)²)
= sqrt(25 + 144)
= sqrt(169)
= 13
||cu|| = c ||u||
c = -3
c ||u|| = -3 × 13 = -39
The magnitude of a vector is given by
|| u|| = sqrt( x^2 + y^2)
= sqrt( 5^2 + (-12)^2)
= sqrt(25+144)
We are then multiplying by a scalar
||cu|| = -3*13 = -39
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