heyguysimacoolperson heyguysimacoolperson
  • 21-05-2018
  • Mathematics
contestada

Find a • b if a = 3i + 8j and b= -0.5i - 4j.

A. (-1.5, -32)

B. -33.5

C. (2.5, 4)

D. -30.5

Respuesta :

carlosego
carlosego carlosego
  • 21-05-2018
For this case we have the following vectors:
 a = 3i + 8j
 b = -0.5i - 4j
 Using product point we have:
 a.b = (3i + 8j). (- 0.5i - 4j)
 a.b = (3) * (- 0.5) + (8) * (- 4)
 a.b = -1.5 + -32
 a.b = -33.5
 Answer:
 
The point product is given by:
 
a.b = -33.5
 
B. -33.5
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