intermediate algebra

oh, ok! here goes

(-10x -9)^2
(-10x -9) (-10x -9)
100x^2 +90x +90x +81
100x^2 +180 +81
 
(-10x -9)^2
(-10x -9) (-10x -9)
100x^2 +90x +90x +81
100x^2 +180 +81

Actually, that should be "180x", not just "180" ( as mmm4444bot kindly brought to my attention). :)
 
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