Answer :

As given in the question, the Sum of 2x – x2 + 5 and -4x – 3 + 7xis given as:

= 2x – x2 + 5 – 4x – 3 + 7x2

= 2x – 4x – x2 + 7x2 + 5 – 3

= -2x + 6x2 + 2 (i)

Now subtracting equation (i) from 5 we get, 

Subtracting (ii) from (i), we get

= 5 - (-2x + 6x2 + 2) 

= 5 + 2x – 6x2 – 2 

= 3 + 2x – 6x2

Therefore, the resultant expression is  3 + 2x – 6x2

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