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Describe how the following expressions are obtained

 Describe how the following expressions are obtained:

         7xy+5, x^{2} y,4x^{2}-5x

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7xy+5 

the above expression is obtained by adding 7xy with 5. Here 7xy is obtained by multiplying 7,x and y

4 x^2-5x 

the above expression is obtained by subtracting the product of 5 and x from the product of 4,x and x

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