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For this case, the first thing we must do is to count similar terms.
 We have then:

 Polynomial 1:
 x ^ 2 = 2
 x = 1
 1 = 3
 The polynomial is:
 2x ^ 2 + x + 3

 Polynomial 2:
 x ^ 2 = 1
 x = 3
 1 = 4
 The polynomial is:
 x ^ 2 + 3x + 4

 Adding we have:
 (2x ^ 2 + x + 3) + (x ^ 2 + 3x + 4)
 x ^ 2 (2 + 1) + x (1 + 3) + (3 + 4)
 3x ^ 2 + 4x + 7

 
 3x ^ 2 + 4x + 7
 option B