Question

If A = 3i+6j, B =xi +k and A. B = 12, then x will be equal to A. 13 B. 2 C. 4 D. 12​

Answer 1

Answer:

option c) 4 is correct

Step-by-step explanation:

A = 3i + 6j

B = xi + k

A . B = (3 * x ) + ( 6 * 0) +;(0 * 1)

12 = 3x + 0 + 0

3x = 12

x = 4