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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)

Answered by Daniel T. • Further Mathematics tutor

2315 Views

Explain trend in why the ionisation energies increase across the period

As we travel along the period the nuclear charge increases, this increases the grip the nuclei of the atom has on the electrons. As they are on the same period they experience almost the exactly the same ...

Answered by Patrick J. • Chemistry tutor

1991 Views

How do I differentiate?

If we have the curve y=x³+3x²-7x+5, to differentiate it we firstly multiply x by its power, and then reduce the power by one.Therefore x³ will differentiate to 3x²

Answered by William H. • Maths tutor

4658 Views

Can you explain the difference between structure and agency?

The debate between structure and agency is fundamental to sociological, anthropological and political theory. But it's also key to how we interpret everyday life. Essentially, it's all down to what shapes...

Answered by Timothy S. • Sociology tutor

32363 Views

Outline what is meant by 'identification' within the Social Learning Theory. Give an example.

An individual may identify with those who they see as role models. For example, a young child may idealise the actions and imitate the actions and behaviour of somebody that they identify with and look up...

Answered by Alexandra O. • Psychology tutor

12323 Views