Question 128183
What is the difference between 2x^2+4xy-3 and x^2-2xy-4 
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(2x^2+4xy-3) - (x^2-2xy-4)

= 2x^2 + 4xy -3 -x^2 + 2xy + 4
Gather "like" terms to get:

= 2x^2-x^2 + 4xy+2xy -3+4

= x^2 + 6xy +1
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Cheers,
Stan H.