A complex number is a number that can be expressed in the form $a + ib$, where a and b are real numbers, and $i$ is a solution of the equation $x^2 = −1$. Because no real number satisfies this equation, $i$ is called an imaginary number. Cartesian form $z=x+iy; x=r\ cos\ θ, t=r\ sin\Read More

In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line. Real number set can be represented by the symbol R. If $a>b$ and $(x-a)(x-b)b$. So $b < x < a$. If $a>b$ and $(x-a)(x-b)>0$ then $x>a$ or $x<b$. So $x < b$ or $x >Read More