Introducing and Writing Complex Numbers (1.12.1)

Question 1

• Numbers like sqrt-4 or sqrt-9.5 that involve the square root of a negative number are called imaginary numbers.

Answer 1

• Numbers like sqrt-4 or sqrt-9.5 that involve the square root of a negative number are called imaginary numbers.

Question 2

• Imaginary numbers can be written in terms of the number i, which is equal to the square root of –1: i=sqrt-1.

Answer 2

• Imaginary numbers can be written in terms of the number i, which is equal to the square root of –1: i=sqrt-1.

Question 3

• A complex number has the form a + bi where a is a real number and bi is some number multiplying with i, an imaginary number.

Answer 3

• A complex number has the form a + bi where a is a real number and bi is some number multiplying with i, an imaginary number.