 Hi and welcome to the session. I'm Kanika and I'm going to help you to solve the calling question. The question says express each of the complex number given in the exercises 1 to 10 in the form a plus iota b. First complex number is 5iota into minus 3 by 5iota. Before solving this question let's first understand what a complex number is. A number of the form a plus iota b where a and b are real numbers is called a complex number. a is called the real part and b is called the imaginary part of the complex number. Complex number consists of two parts real and imaginary is equal to square root of minus 1. Since iota is equal to square root of minus 1 so this implies iota square is equal to minus 1. Let's now proceed on with our solution. Given complex number is 5iota into minus 3 by 5iota. This is equal to 5 into minus 3 by 5 is minus 3. iota into iota is iota square and we know that iota square is equal to minus 1 so we have minus 3 into minus 1 and this is equal to 3 and our solution is 3. So we have expressed the given complex number in the form a plus iota b here a is equal to 3 and b is equal to 0. So this completes the session. Bye and take care.