Tangible refers to things we can see and feel whereas intangible are things that cannot be seen or felt. Let us understand this by an example. Suppose the cost of doing an MBA course from a top business schools is $100000 while the cost of a low rung school is $50000.
Complex numbers have both a real number element and an imaginary number element, usually in the form a + bi. In this form, a and b are real numbers, while i is an imaginary number. An imaginary number is the designation given for the square root of negative one. Many careers that employ higher mathematics also use complex numbers, which can help simplify mathematical equations that would otherwise be much longer.
An imaginary number is a quantity of the form ix, where x is a real number and i is the positive square root of -1. The term imaginary probably originated from the fact that there is no real number z that satisfies the equation z 2 = -1. But imaginary numbers are no less real than real numbers. The quantity i is called the unit imaginary number. In engineering, it is denoted j, and is known as the j operator.