Solve for c
c=-\frac{8}{5}+\frac{1}{5}i=-1.6+0.2i
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c≔-\frac{8}{5}+\frac{1}{5}i
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c=\frac{\left(-3+2i\right)\left(2+i\right)}{\left(2-i\right)\left(2+i\right)}
Multiply both numerator and denominator of \frac{-3+2i}{2-i} by the complex conjugate of the denominator, 2+i.
c=\frac{\left(-3+2i\right)\left(2+i\right)}{2^{2}-i^{2}}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
c=\frac{\left(-3+2i\right)\left(2+i\right)}{5}
By definition, i^{2} is -1. Calculate the denominator.
c=\frac{-3\times 2-3i+2i\times 2+2i^{2}}{5}
Multiply complex numbers -3+2i and 2+i like you multiply binomials.
c=\frac{-3\times 2-3i+2i\times 2+2\left(-1\right)}{5}
By definition, i^{2} is -1.
c=\frac{-6-3i+4i-2}{5}
Do the multiplications in -3\times 2-3i+2i\times 2+2\left(-1\right).
c=\frac{-6-2+\left(-3+4\right)i}{5}
Combine the real and imaginary parts in -6-3i+4i-2.
c=\frac{-8+i}{5}
Do the additions in -6-2+\left(-3+4\right)i.
c=-\frac{8}{5}+\frac{1}{5}i
Divide -8+i by 5 to get -\frac{8}{5}+\frac{1}{5}i.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}