Mathematicians once turned up their noses at imaginary numbers. But complex analysis actually simplifies math and physics.

If a quadratic equation can be factorised, the factors can be used to find the roots of the equation. The equation factorises to give \((x + 3) (x - 2) = 0 \) so the solutions to the equation \(x ...

If a quadratic equation can be factorised, the factors can be used to find the roots of the equation. The equation factorises to give \((x + 3) (x - 2) = 0 \) so the solutions to the equation \(x ...

A positive number times itself is a positive ... the expression under the square root in the quadratic formula – is negative. They might have brushed this under the rug as something to deal ...