It is given that z = 3i(7-i)(i+1). Show that z can be written in the form 24i - k. State the integer k.
z = 3i(7-i)(i+1)= 3i(7i-i+7-i2 )= 3i(6i+8)= 18i2 +24 (1 method mark)= 24i-18 (1 method mark)k=18 (1 answer mark)
DT
Answered by Daniel T. • Further Mathematics tutor
2812 Views
See similar Further Mathematics A Level tutorsRelated Further Mathematics A Level answers
All answers ▸How does proof by induction work?
How to multiply and divide by complex numbers
Show that the sum from 1 to n of 1/(2n+1)(2n-1) is equal to n/(2n+1) by Induction
How do I sketch accurate graphs for rational functions in a short amount of time? (I.e. A step by step guide of sketching graphs)