24 Consider the vectors c31 4j and d5i12 Calculate the scala

24. Consider the vectors c-31+ 4j and d-5i-12 Calculate the scalar product c-d Working Answer: (Total 2 marks)

c= 3i+4j
d = 5i-12j

c.d = (3i+4j)*(5i-12j) = 3i*(5i) + (3i*-12j) + 4j*5i + 4j*-12j = 15+0+0-48 = -33

Please note that i and j are perpendicular to each other , hence a scaler producct of i and j i.e. i.j is 0

Answer is -33