Evaluate
2\left(x^{2}-9x-2\right)
Expand
2x^{2}-18x-4
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x^{2}-4x+3-\left(-x^{2}\right)-14x-7
To find the opposite of -x^{2}+14x+7, find the opposite of each term.
x^{2}-18x+3-\left(-x^{2}\right)-7
Combine -4x and -14x to get -18x.
x^{2}-18x-4-\left(-x^{2}\right)
Subtract 7 from 3 to get -4.
x^{2}-18x-4+x^{2}
Multiply -1 and -1 to get 1.
2x^{2}-18x-4
Combine x^{2} and x^{2} to get 2x^{2}.
x^{2}-4x+3-\left(-x^{2}\right)-14x-7
To find the opposite of -x^{2}+14x+7, find the opposite of each term.
x^{2}-18x+3-\left(-x^{2}\right)-7
Combine -4x and -14x to get -18x.
x^{2}-18x-4-\left(-x^{2}\right)
Subtract 7 from 3 to get -4.
x^{2}-18x-4+x^{2}
Multiply -1 and -1 to get 1.
2x^{2}-18x-4
Combine x^{2} and x^{2} to get 2x^{2}.
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}