Evaluate
\left(13-x\right)\left(x+9\right)
Expand
117+4x-x^{2}
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13x+117-x\left(x+9\right)
Use the distributive property to multiply 13 by x+9.
13x+117-\left(x^{2}+9x\right)
Use the distributive property to multiply x by x+9.
13x+117-x^{2}-9x
To find the opposite of x^{2}+9x, find the opposite of each term.
4x+117-x^{2}
Combine 13x and -9x to get 4x.
13x+117-x\left(x+9\right)
Use the distributive property to multiply 13 by x+9.
13x+117-\left(x^{2}+9x\right)
Use the distributive property to multiply x by x+9.
13x+117-x^{2}-9x
To find the opposite of x^{2}+9x, find the opposite of each term.
4x+117-x^{2}
Combine 13x and -9x to get 4x.
Examples
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Simultaneous equation
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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