Evaluate
\left(x-9\right)\left(x-5\right)
Expand
x^{2}-14x+45
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x^{2}-14x+49-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-7\right)^{2}.
x^{2}-14x+45
Subtract 4 from 49 to get 45.
x^{2}-14x+49-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-7\right)^{2}.
x^{2}-14x+45
Subtract 4 from 49 to get 45.
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\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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