# Simplifying and giving answers in cartesian form

• Nov 3rd 2013, 04:44 AM
Question101
Simplifying and giving answers in cartesian form
Hi there i have a question to ask

The following must be simplify and must be answered in cartesian form, present your answer on an argand diagram. Im not too sure how to do these could someone explain it please? thank you :)

Question (a)

(4+5j)(4+5j)

Question (b)

(-5-2j)(5+2j)
• Nov 3rd 2013, 05:41 AM
topsquark
Re: Simplifying and giving answers in cartesian form
Quote:

Originally Posted by Question101
Hi there i have a question to ask

The following must be simplify and must be answered in cartesian form, present your answer on an argand diagram. Im not too sure how to do these could someone explain it please? thank you :)

Question (a)

(4+5j)(4+5j)

Question (b)

(-5-2j)(5+2j)

Just FOIL them out. For example, for a) $\displaystyle (4 + 5j)(4 + 5j) = 4 \cdot 4 + 4 \cdot 5j + 5j \cdot 4 + 5j \cdot 5j$

Then use $\displaystyle j^2 = -1$ and collect like terms.

-Dan
The text contains a post from a user asking for help with simplifying complex number expressions and presenting the answers in Cartesian form on an Argand diagram. The user provides two specific questions without their answers, and another user responds with guidance on how to solve them.
multiple_questions
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
# Simplifying and giving answers in cartesian form

• Nov 3rd 2013, 04:44 AM
Question101
Simplifying and giving answers in cartesian form
Hi there i have a question to ask

The following must be simplify and must be answered in cartesian form, present your answer on an argand diagram. Im not too sure how to do these could someone explain it please? thank you :)

Question (a)

(4+5j)(4+5j)

Question (b)

(-5-2j)(5+2j)
• Nov 3rd 2013, 05:41 AM
topsquark
Re: Simplifying and giving answers in cartesian form
Quote:

Originally Posted by Question101
Hi there i have a question to ask

The following must be simplify and must be answered in cartesian form, present your answer on an argand diagram. Im not too sure how to do these could someone explain it please? thank you :)

Question (a)

(4+5j)(4+5j)

Question (b)

(-5-2j)(5+2j)

Just FOIL them out. For example, for a) $\displaystyle (4 + 5j)(4 + 5j) = 4 \cdot 4 + 4 \cdot 5j + 5j \cdot 4 + 5j \cdot 5j$

Then use $\displaystyle j^2 = -1$ and collect like terms.

-Dan
user
The text contains a post from a user asking for help with simplifying complex number expressions and presenting the answers in Cartesian form on an Argand diagram. The user provides two specific questions without their answers, and another user responds with guidance on how to solve them.

TYPE: MULTIPLE_QUESTIONS