Evaluate
-\frac{1}{4}+\frac{5}{21}i\approx -0.25+0.238095238i
Real Part
-\frac{1}{4} = -0.25
Share
Copied to clipboard
\frac{-2}{8}+\frac{5i}{21}
Subtract 4 from 2 to get -2.
-\frac{1}{4}+\frac{5i}{21}
Reduce the fraction \frac{-2}{8} to lowest terms by extracting and canceling out 2.
-\frac{1}{4}+\frac{5}{21}i
Divide 5i by 21 to get \frac{5}{21}i.
Re(\frac{-2}{8}+\frac{5i}{21})
Subtract 4 from 2 to get -2.
Re(-\frac{1}{4}+\frac{5i}{21})
Reduce the fraction \frac{-2}{8} to lowest terms by extracting and canceling out 2.
Re(-\frac{1}{4}+\frac{5}{21}i)
Divide 5i by 21 to get \frac{5}{21}i.
-\frac{1}{4}
The real part of -\frac{1}{4}+\frac{5}{21}i is -\frac{1}{4}.
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}