Question

if A= 3i -4j and B= -i -4j calculate A + B and magnitude of A+B​

Answer 1

Answer:

magnitude of a+b=

$\sqrt{ {3 }^{2} + {4 }^{2} } = \sqrt{25 } = 5$

magnitude of a+b =5

Answer 2

Answer:

Step-by-step explanation:

A + B = (3 - 1)i - (4 + 4)j = 2i - 8j

|A + B| = sqrt(2^2 + (- 8)^2)

= sqrt(4 + 64) = sqrt(68)

= 2sqrt(17)