(x-4)(x-9) i got to the part where its 1x^2-13x^2+36. Are you canceling the variables and powers when taking 1-13 since…

(x-4)(x-9) i got to the part where its 1x^2-13x^2+36. Are you canceling the variables and powers when taking 1-13 since they are the same. Or are you adding a negative so you add the variables?
 
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