## Algebra: A Combined Approach (4th Edition)

$2x^{2}+11x$
$(5x+8)-(-2x^{2}-6x+8)$ First, let's remove the grouping symbols. To remove the second parentheses, we need to change the sign of every term inside it: $(5x+8)-(-2x^{2}-6x+8)=5x+8+2x^{2}+6x-8=...$ Simplify by combining like terms: $...=2x^{2}+(5+6)x+(8-8)=2x^{2}+11x$