Evaluate
\left(x-2\right)\left(2x-7\right)
Expand
2x^{2}-11x+14
Graph
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2\left(9-6x+x^{2}\right)+x-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3-x\right)^{2}.
18-12x+2x^{2}+x-4
Use the distributive property to multiply 2 by 9-6x+x^{2}.
18-11x+2x^{2}-4
Combine -12x and x to get -11x.
14-11x+2x^{2}
Subtract 4 from 18 to get 14.
2\left(9-6x+x^{2}\right)+x-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3-x\right)^{2}.
18-12x+2x^{2}+x-4
Use the distributive property to multiply 2 by 9-6x+x^{2}.
18-11x+2x^{2}-4
Combine -12x and x to get -11x.
14-11x+2x^{2}
Subtract 4 from 18 to get 14.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}