Evaluate
-70+90i
Real Part
-70
Share
Copied to clipboard
10\times 1+10\times \left(8i\right)+10i\times 1+10\times 8i^{2}
Multiply complex numbers 10+10i and 1+8i like you multiply binomials.
10\times 1+10\times \left(8i\right)+10i\times 1+10\times 8\left(-1\right)
By definition, i^{2} is -1.
10+80i+10i-80
Do the multiplications.
10-80+\left(80+10\right)i
Combine the real and imaginary parts.
-70+90i
Do the additions.
Re(10\times 1+10\times \left(8i\right)+10i\times 1+10\times 8i^{2})
Multiply complex numbers 10+10i and 1+8i like you multiply binomials.
Re(10\times 1+10\times \left(8i\right)+10i\times 1+10\times 8\left(-1\right))
By definition, i^{2} is -1.
Re(10+80i+10i-80)
Do the multiplications in 10\times 1+10\times \left(8i\right)+10i\times 1+10\times 8\left(-1\right).
Re(10-80+\left(80+10\right)i)
Combine the real and imaginary parts in 10+80i+10i-80.
Re(-70+90i)
Do the additions in 10-80+\left(80+10\right)i.
-70
The real part of -70+90i is -70.
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}