Add: $(3x^{2} + 5x - 2)$ and $(x^{2} - 3x + 7)$.

Add: $(3x^{2} + 5x - 2)$ and $(x^{2} - 3x + 7)$.
  1. $4x^{2} + 2x + 5$
  2. $4x^{2} + 8x + 5$
  3. $4x^{2} - 2x + 5$
  4. $2x^{2} + 2x + 5$

Solution

$(3x^{2}+x^{2}) + (5x-3x) + (-2+7) = 4x^{2} + 2x + 5$.

Asked in: IMO

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