Evaluate
\left(a-2\right)\left(a+9\right)
Expand
a^{2}+7a-18
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a^{2}-2a+9a-18
Apply the distributive property by multiplying each term of a+9 by each term of a-2.
a^{2}+7a-18
Combine -2a and 9a to get 7a.
a^{2}-2a+9a-18
Apply the distributive property by multiplying each term of a+9 by each term of a-2.
a^{2}+7a-18
Combine -2a and 9a to get 7a.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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