Resources tagged with: Complex numbers

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There are 19 NRICH Mathematical resources connected to Complex numbers, you may find related items under The Number System and Place Value.

Broad Topics > The Number System and Place Value > Complex numbers

Complex Partial Fractions

Age 16 to 18
Challenge Level

To break down an algebraic fraction into partial fractions in which all the denominators are linear and all the numerators are constants you sometimes need complex numbers.

Three by One

Age 16 to 18
Challenge Level

There are many different methods to solve this geometrical problem - how many can you find?

8 Methods for Three by One

Age 14 to 18
Challenge Level

This problem in geometry has been solved in no less than EIGHT ways by a pair of students. How would you solve it? How many of their solutions can you follow? How are they the same or different?. . . .

Sheep in Wolf's Clothing

Age 16 to 18
Challenge Level

Can you work out what simple structures have been dressed up in these advanced mathematical representations?

Impedance Can Be Complex!

Age 16 to 18
Challenge Level

Put your complex numbers and calculus to the test with this impedance calculation.

Pumping the Power

Age 16 to 18
Challenge Level

What is an AC voltage? How much power does an AC power source supply?

What Are Numbers?

Age 7 to 18

Ranging from kindergarten mathematics to the fringe of research this informal article paints the big picture of number in a non technical way suitable for primary teachers and older students.

Two and Four Dimensional Numbers

Age 16 to 18
Challenge Level

Investigate matrix models for complex numbers and quaternions.

Sextet

Age 16 to 18
Challenge Level

Investigate x to the power n plus 1 over x to the power n when x plus 1 over x equals 1.

Footprints

Age 16 to 18
Challenge Level

Make a footprint pattern using only reflections.

What Are Complex Numbers?

Age 16 to 18

This article introduces complex numbers, brings together into one bigger 'picture' some closely related elementary ideas like vectors and the exponential and trigonometric functions and. . . .

Complex Sine

Age 16 to 18
Challenge Level

Solve the equation sin z = 2 for complex z. You only need the formula you are given for sin z in terms of the exponential function, and to solve a quadratic equation and use the logarithmic function.

Thousand Words

Age 16 to 18
Challenge Level

Here the diagram says it all. Can you find the diagram?

Cube Roots

Age 16 to 18
Challenge Level

Evaluate without a calculator: (5 sqrt2 + 7)^{1/3} - (5 sqrt2 - 7)^1/3}.

Napoleon's Theorem

Age 14 to 18
Challenge Level

Triangle ABC has equilateral triangles drawn on its edges. Points P, Q and R are the centres of the equilateral triangles. What can you prove about the triangle PQR?

Complex Rotations

Age 16 to 18
Challenge Level

Choose some complex numbers and mark them by points on a graph. Multiply your numbers by i once, twice, three times, four times, ..., n times? What happens?

An Introduction to Complex Numbers

Age 16 to 18

A short introduction to complex numbers written primarily for students aged 14 to 19.

Target Six

Age 16 to 18
Challenge Level

Show that x = 1 is a solution of the equation x^(3/2) - 8x^(-3/2) = 7 and find all other solutions.

Roots and Coefficients

Age 16 to 18
Challenge Level

If xyz = 1 and x+y+z =1/x + 1/y + 1/z show that at least one of these numbers must be 1. Now for the complexity! When are the other numbers real and when are they complex?