Evaluate
\frac{18}{5}-\frac{6}{5}i=3.6-1.2i
Real Part
\frac{18}{5} = 3\frac{3}{5} = 3.6
Share
Copied to clipboard
\frac{3}{5}\times 6-\frac{1}{5}i\times 6
Multiply \frac{3}{5}-\frac{1}{5}i times 6.
\frac{18}{5}-\frac{6}{5}i
Do the multiplications.
Re(\frac{3}{5}\times 6-\frac{1}{5}i\times 6)
Multiply \frac{3}{5}-\frac{1}{5}i times 6.
Re(\frac{18}{5}-\frac{6}{5}i)
Do the multiplications in \frac{3}{5}\times 6-\frac{1}{5}i\times 6.
\frac{18}{5}
The real part of \frac{18}{5}-\frac{6}{5}i is \frac{18}{5}.
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}