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Find the sum or the difference"type your answer in the form a+bi"

Find the sum or the difference"type your answer in the form a+bi"-example-1
User Mightyteja
by
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1 Answer

2 votes

5 - 9i

Step-by-step explanation:
\begin{gathered} \text{Given:} \\ (3\text{ - 4i) - (5 + 4i) - (-7 + i)} \end{gathered}

To solve the question above, we need to expand the parenthesis:


\begin{gathered} 3\text{ - 4i - (5) -(4i) -(-7) -(i)} \\ mu\text{ltiplication of same signs give positive sign} \\ m\text{ ultiplication of opposite signs give negative sign} \\ 3\text{ - 4i - 5 - 4i + 7 - i} \end{gathered}

collect like terms:


\begin{gathered} 3\text{ - 5 + 7 -4i - 4i - i} \\ =\text{ 5 }-\text{ 9i} \end{gathered}

User Kit Fisto
by
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