Evaluate
-1-21i
Real Part
-1
Share
Copied to clipboard
-10-15i-6i+9
Apply the distributive property by multiplying each term of 5i-3 by each term of 2i-3.
-10+9+\left(-15-6\right)i
Combine the real and imaginary parts.
-1-21i
Do the additions.
Re(-10-15i-6i+9)
Apply the distributive property by multiplying each term of 5i-3 by each term of 2i-3.
Re(-10+9+\left(-15-6\right)i)
Combine the real and imaginary parts in -10-15i-6i+9.
Re(-1-21i)
Do the additions in -10+9+\left(-15-6\right)i.
-1
The real part of -1-21i is -1.
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}