Evaluate
2.9-0.4i
Real Part
2.9
Share
Copied to clipboard
-4.2-8.6i+\left(7.1+8.2i\right)
The opposite of -7.1-8.2i is 7.1+8.2i.
-4.2+7.1+\left(-8.6+8.2\right)i
Combine the real and imaginary parts in numbers -4.2-8.6i and 7.1+8.2i.
2.9-0.4i
Add -4.2 to 7.1. Add -8.6 to 8.2.
Re(-4.2-8.6i+\left(7.1+8.2i\right))
The opposite of -7.1-8.2i is 7.1+8.2i.
Re(-4.2+7.1+\left(-8.6+8.2\right)i)
Combine the real and imaginary parts in numbers -4.2-8.6i and 7.1+8.2i.
Re(2.9-0.4i)
Add -4.2 to 7.1. Add -8.6 to 8.2.
2.9
The real part of 2.9-0.4i is 2.9.
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}