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)
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