Math, asked by gazal172, 9 months ago

find modulus of (3i-1)²

Answers

Answered by MaheswariS
1

\textbf{Given:}

\mathsf{(3\,i-1)^2}

\textbf{To find:}

\textsf{Modulus of}\;\mathsf{(3\,i-1)^2}

\textbf{Solution:}

\textbf{Concept used:}

\boxed{\begin{minipage}{7cm}$\\\textsf{The modulus of the complex number z=x+iy is}\\\\\mathsf{\;\;\;\;|z|=\sqrt{x^2+y^2}}\\$\end{minipage}}

\mathsf{Consider,}

\mathsf{|(3\,i-1)^2|}

\mathsf{We\;know\;that,}

\boxed{\mathsf{|z^n|=|z|^n}}

\mathsf{|(3\,i-1)^2|=|3\,i-1|^2}

\mathsf{|(3\,i-1)^2|=(\sqrt{(-1)^2+3^2})^2}

\mathsf{|(3\,i-1)^2|=(\sqrt{1+9})^2}

\mathsf{|(3\,i-1)^2|=(\sqrt{10})^2}

\implies\boxed{\mathsf{|(3\,i-1)^2|=10}}

\textbf{Find more:}

If z=√37 + √-19 Find |Z|​

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Find the modulus of 15-7i÷15+7i​

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