Question

If A=3i+ 2 and B i - 2j + 3k, find the magnitudes of A+ B and A- B. Pls, answer this along with an explanation.

Answer 1

Answer:

A+B = 3i+2j+i-2j+3k

= 4i +3k

Magnitude is

|A+B| = under root {4^2+(3)^2}

= under root (16+9)

= under root 25

= 5.

Similarly, |A-B| can be calculated.