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How can we describe complex numbers ?

The simplest way to describe a complex number is by its real and imaginary part, z=x+yi, this may be wrote as Re(z)=x and Im(z)=y. These complex numbers follow the same rules as normal algebra, that is we ca...
TL
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Q4 on 2017 Edexcel C4 paper, concerns differentiation of multiple variables.

(a) Asks to differentiate an equation C: 4x 2 - y 3 - 4xy + 2 y = 0Then use the fact that point P (-2,4), lies on C to find an expression for dy/dx Differential of form 8x - 3y 2 (dy/dx) - (4y + 4x(dy/dx)) +...
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Answered by Alexander W. • Maths tutor
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7x + 6 > 1 + 2x

In order to solve this, we need to bring all of the x values to one side, we can do this by subtracting the 2x from both sides7x + 6 - 2x > 1 + 2x - 2x5x + 6 > 1 We then need to move the values onto th...
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Answered by Mala P. • Maths tutor
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Evaluate the view that, despite criticisms, the Electoral college is by far the best method of electing the US President

The Electoral College guarantees every state 3 votes which causes small states to be over-represented. In 2004, California had 34 million people with 55 votes and Wyoming had 500,000 people with 3 votes. Thi...
SR
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Historians have disagreed about the role of Soviet expansion in the origins of the Cold War. What is your view about the role of Soviet expansion in the origins of the Cold War?

The ideal that Soviet expansion caused the Cold War is the traditional view of its origin, with Orthodox historians like George F. Kennan attributing the prolonged conflict to “an expansionist Soviet Union… ...
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Answered by Shay R. • History tutor
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