Add the Polynomials $6 p ^ { 2 } + 3 p + 15 \text { and } - 8 p ^ { 2 } - 7 p + 14$

Add the polynomials. $6 p ^ { 2 } + 3 p + 15 \text { and } - 8 p ^ { 2 } - 7 p + 14$