Evaluate
\left(7-x\right)\left(x+9\right)
Expand
63-2x-x^{2}
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64-\left(x^{2}+2x+1\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
64-x^{2}-2x-1
To find the opposite of x^{2}+2x+1, find the opposite of each term.
63-x^{2}-2x
Subtract 1 from 64 to get 63.
64-\left(x^{2}+2x+1\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
64-x^{2}-2x-1
To find the opposite of x^{2}+2x+1, find the opposite of each term.
63-x^{2}-2x
Subtract 1 from 64 to get 63.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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
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Limits
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