ANSWER
h(x) = -10x² - x - 1
EXPLANATION
First we have to write f(x) and g(x) in the sum:
[tex]h(x)=f(x)+g(x)[/tex][tex]h(x)=(-2x^2+3x-6)+(5-4x-8x^2)[/tex]
Then we have to add like terms. To do this we have to group the terms by the exponent of the variable:
[tex]\begin{gathered} h(x)=(-2x^2-8x^2)+(3x-4x)+(-6+5) \\ h(x)=-10x^2-x-1 \end{gathered}[/tex]
