Math, asked by lovelyArpita, 11 months ago

(x - yi) (2 + 3i)=
X +
2i
/1 - i​

Answers

Answered by MaheswariS
9

\underline{\textbf{Given:}}

\mathsf{(x-iy)(2+3i)=\dfrac{x+2\,i}{1-i}}

\underline{\textbf{To find:}}

\textsf{The value of x and y}

\underline{\textbf{Solution:}}

\underline{\textbf{Concept used:}}

\mathsf{(1)\;i=\sqrt{-1}}

\mathsf{(2)\;a+i\,b=c+i\,d\;\implies\;a=c\;and\;b=d}

\mathsf{Consider,}

\mathsf{(x-iy)(2+3i)=\dfrac{x+2\,i}{1-i}}

\implies\mathsf{(x-iy)(2+3i)(1-i)=x+2\,i}

\implies\mathsf{(x-iy)(2-2\,i+3\,i-3i^2)=x+2\,i}

\mathsf{Using,\;i^2=-1,\;we\;get}

\mathsf{(x-iy)(2-2\,i+3\,i+3)=x+2\,i}

\mathsf{(x-iy)(5+i)=x+2\,i}

\mathsf{5x+x\,i-i\,5y-i^2y=x+2\,i}

\mathsf{5x+x\,i-i\,5y+y=x+2\,i}

\mathsf{(5x+y)+i(x-5y)=x+2\,i}

\textsf{Separating real and imaginary parts on}

\textsf{bothsides, we get}

\mathsf{5x+y=x\;\;and\;\;x-5y=2}

\mathsf{y=-4x\;\;and\;\;x-5y=2}

\textsf{using these two equations, we get}

\mathsf{x-5(-4x)=2}

\mathsf{x+20x=2}

\mathsf{21\,x=2}

\implies\boxed{\mathsf{x=\dfrac{2}{21}}}

\mathsf{y=-4x}

\mathsf{y=-4\left(\dfrac{2}{21}\right)}

\implies\boxed{\mathsf{y=\dfrac{-8}{21}}}

\underline{\textbf{Answer:}}

\mathsf{x=\dfrac{2}{21}\;\;and\;\;y=\dfrac{-8}{21}}

\underline{\textbf{Find more:}}

Write (a+ib/a-ib)^2-(a-ib/a+ib)^2 in the form x +iy please reply me this

https://brainly.in/question/18153048

If (1+i)(1+2i)(1+3i).....(1+ni)=x+iy, then 2.5.10.....(1+n2) = ?https://brainly.in/question/4393111

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