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

Therefore roots occur at (-1, 0) and (3, 0). If we imagine multiplying out the brackets, you can see we will get a positive \({x ... this into the original equation.

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 ... happens when (b 2 —4ac)—the expression under the square root in the quadratic formula—is negative. They might have brushed this under the ...