Top answers

What are complex numbers?

A complex number is a number made up of a real and imaginary part.
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Answered by Chris W. • Maths tutor
6602 Views

How do you prove that (3^n)-1 is always a multiple of 2?

Proof by Induction: The method of Proof by Induction is a simple but very powerful technique. It involves 3 steps: 1) Showing a claim is true for a basic integer value of n (e.g. 0 or 1) 2) Assuming the clai...
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Answered by Saleem A. • Maths tutor
19863 Views

How do you add or subtract complex numbers?

A complex number has the form a+bi. We call a the 'real' bit (ie. the bit on a regular number line) and b is the 'imaginary' bit. To add or subtract complex numbers you just add the real bits of both togethe...
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Answered by Chloe B. • Maths tutor
6066 Views

How to sum an arithmetic progression?

Whilst it is very easy to just plug the numbers into the formula you are given on your formula sheet there is a much faster and more intuitive method of doing this. If we have n numbers beginning at a with a...
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Answered by Vandan P. • Maths tutor
6463 Views

How to find y-intercept on a graphical calculator

Your graphical calculator is your best friend. Never leave home without it, providing you're going to a class or an exam. Using graphs we can work out intercepts; solve simulatneous equations and help you ou...
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Answered by Emily H. • Maths tutor
7031 Views