Evaluate
-8-9i
Real Part
-8
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-6-2+\left(-1-8\right)i
Combine the real and imaginary parts in numbers -6-i and -2-8i.
-8-9i
Add -6 to -2. Add -1 to -8.
Re(-6-2+\left(-1-8\right)i)
Combine the real and imaginary parts in numbers -6-i and -2-8i.
Re(-8-9i)
Add -6 to -2. Add -1 to -8.
-8
The real part of -8-9i is -8.
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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
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Limits
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