Question

(-2x^2+5x-8)+(-9-7x+8x^2)+(3+7x^2-2x)

Answer 1

remove parentheses and combine like terms

Answer 2

\[-2x^2+5x-8-9-7x+8x^2+3+7x^2-2x\]
\[8x^2+7x^2-2x^2=13x^2\]
\[5x-7x-2x=-4x\]
\[-8-9+3=-14\]
"final answer"
\[13x^2-4x-14\]