Evaluate
\left(x+\left(-4-5i\right)\right)\left(x+\left(-4+5i\right)\right)
Expand
x^{2}-8x+41
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\left(x+\left(-4-5i\right)\right)\left(x-\left(4-5i\right)\right)
Multiply -1 and 4+5i to get -4-5i.
\left(x+\left(-4-5i\right)\right)\left(x+\left(-4+5i\right)\right)
Multiply -1 and 4-5i to get -4+5i.
x^{2}+\left(-4+5i\right)x+\left(-4-5i\right)x+41
Apply the distributive property by multiplying each term of x+\left(-4-5i\right) by each term of x+\left(-4+5i\right).
x^{2}-8x+41
Combine \left(-4+5i\right)x and \left(-4-5i\right)x to get -8x.
\left(x+\left(-4-5i\right)\right)\left(x-\left(4-5i\right)\right)
Multiply -1 and 4+5i to get -4-5i.
\left(x+\left(-4-5i\right)\right)\left(x+\left(-4+5i\right)\right)
Multiply -1 and 4-5i to get -4+5i.
x^{2}+\left(-4+5i\right)x+\left(-4-5i\right)x+41
Apply the distributive property by multiplying each term of x+\left(-4-5i\right) by each term of x+\left(-4+5i\right).
x^{2}-8x+41
Combine \left(-4+5i\right)x and \left(-4-5i\right)x to get -8x.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}