Evaluate
\left(x-9\right)\left(x-4\right)
Expand
x^{2}-13x+36
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36-12x+x^{2}-x
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(6-x\right)^{2}.
36-13x+x^{2}
Combine -12x and -x to get -13x.
36-12x+x^{2}-x
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(6-x\right)^{2}.
36-13x+x^{2}
Combine -12x and -x to get -13x.
Examples
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Matrix
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Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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