Find the Indicated Sum or Difference $\left( 3 x ^ { 2 } + 8 x + 3 \right) + \left( 9 x ^ { 2 } - 6 x + 2 \right)$

Short Answer

Find the indicated sum or difference. $\left( 3 x ^ { 2 } + 8 x + 3 \right) + \left( 9 x ^ { 2 } - 6 x + 2 \right)$