Any number of the form is called an imaginary number, and it is a complex number with an equal to zero. A complex number is generally denoted by z and the imaginary part of any complex number is represented by I[z]. (More than one of these description may apply) 1. 13i 3. pure imaginary number an imaginary number of the form a+bi where a is 0; , A number of the form bi, where b ≠ 0. In mathematics the symbol for √(−1) is i for imaginary. Well i can! It takes about six paragraphs. Can you take the square root of −1? So a complex number has a real part ("a") and an imaginary part ("bi"). In order to find roots of complex numbers, which can be expressed as imaginary numbers, require the complex numbers to be written in exponential form. Learn about the imaginary unit i, about the imaginary numbers, and about square roots of negative numbers. I’m going to give the real definition and motivation for complex numbers. Imaginary numbers are called imaginary because they are impossible and, therefore, exist only in the world of ideas and pure imagination. The imaginary part of a complex number is, hence, a real number that is accompanied by the imaginary unit . The square root of minus one √(−1) is the "unit" Imaginary Number, the equivalent of 1 for Real Numbers. I sense some confusion in your question. any number that can be written in the form of a + bi where a and b are real numbers. A pure imaginary number is any complex number whose real part is equal to 0. $\begingroup$ It should be added that in modern mathematics there is almost never any reason to talk about imaginary numbers in general -- just about everything you can say about imaginary numbers is just as valid about all the complex numbers, so it is usually said in that more general form. In the real numbers, 1 is the real unit, and the set of all real numbers (also known as the real number line) is just the set of all multiples of this unit by a real number.In the same way, we can construct an imaginary number line consisting of all multiples of the imaginary unit by a real number. Imaginary numbers result from taking the square root of a negative number. pure imaginary number. Unit Imaginary Number. All imaginary numbers are complex numbers but all complex numbers don't need to be imaginary numbers. standard form. A complex number a+bi in which a =0 and b ≠ 0 is a pure imaginary number. A complex number a+bi in which b ≠ 0 is a non-real complex number. A pure imaginary number is any complex number whose real part is equal to 0. Complex numbers are in the form a+bi, where a and b are real numbers. Such a number, written as for some real number , is an imaginary number. -4 2. The simplest explanation is that an imaginary number is the square root of a negative number (or any even root for that matter). Question 484664: Identify each number as real, complex, pure imaginary, or nonreal complex. But in electronics they use j (because "i" already means current, and the next letter after i is j). non-real complex number. 5+i Answer by richard1234(7193) (Show Source): A complex number written in the form a+bi (or a+ib) is in standard form. For example, √-4 = 2i, which is a pure imaginary number. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. If a = 0 and b uni2260.alt1 0, the number a + bi is a pure imaginary number. If you're seeing this message, it means we're having trouble loading external resources on our website.