Tutorial - Learn how to subtract an imaginary term from a complex number ex 14, (3 + 2i) - 9i

The video tutorial demonstrates how to simplify an expression involving imaginary numbers. It begins by explaining the expression and the unnecessary use of parentheses. The teacher then focuses on identifying and combining like terms, specifically the imaginary numbers, to simplify the expression to its final form.

What is the initial expression that needs to be simplified?

• 3 + 2i - 9i

• 3 - 2i + 9i

• 3 - 9i + 2i

• 3 + 9i - 2i

Why are parentheses not necessary in the expression 3 + 2i - 9i?

• Because the terms are not like terms

• Because there is no negative sign to distribute

• Because the expression is a polynomial

• Because the expression is already simplified

What are the like terms in the expression 3 + 2i - 9i?

• 2i and 9i

• 3 and 9i

• 3 and 2i

• 3 and 2i - 9i

What is the simplified form of the expression 3 + 2i - 9i?

• 3 + 11i

• 3 - 7i

• 3 + 7i

• 3 - 11i

How do you combine the imaginary terms 2i and -9i?

• Divide them to get -4.5i

• Add them to get 11i

• Multiply them to get -18i

• Subtract them to get -7i