Evaluate
\frac{\left(x-2\right)\left(x+1\right)}{2}
Expand
\frac{x^{2}}{2}-\frac{x}{2}-1
Graph
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\left(\frac{1}{2}x+\frac{1}{2}\left(-2\right)\right)\left(x+1\right)
Use the distributive property to multiply \frac{1}{2} by x-2.
\left(\frac{1}{2}x+\frac{-2}{2}\right)\left(x+1\right)
Multiply \frac{1}{2} and -2 to get \frac{-2}{2}.
\left(\frac{1}{2}x-1\right)\left(x+1\right)
Divide -2 by 2 to get -1.
\frac{1}{2}xx+\frac{1}{2}x-x-1
Apply the distributive property by multiplying each term of \frac{1}{2}x-1 by each term of x+1.
\frac{1}{2}x^{2}+\frac{1}{2}x-x-1
Multiply x and x to get x^{2}.
\frac{1}{2}x^{2}-\frac{1}{2}x-1
Combine \frac{1}{2}x and -x to get -\frac{1}{2}x.
\left(\frac{1}{2}x+\frac{1}{2}\left(-2\right)\right)\left(x+1\right)
Use the distributive property to multiply \frac{1}{2} by x-2.
\left(\frac{1}{2}x+\frac{-2}{2}\right)\left(x+1\right)
Multiply \frac{1}{2} and -2 to get \frac{-2}{2}.
\left(\frac{1}{2}x-1\right)\left(x+1\right)
Divide -2 by 2 to get -1.
\frac{1}{2}xx+\frac{1}{2}x-x-1
Apply the distributive property by multiplying each term of \frac{1}{2}x-1 by each term of x+1.
\frac{1}{2}x^{2}+\frac{1}{2}x-x-1
Multiply x and x to get x^{2}.
\frac{1}{2}x^{2}-\frac{1}{2}x-1
Combine \frac{1}{2}x and -x to get -\frac{1}{2}x.
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}