Hi there! The answer is B.
[tex]( x^{2} -x+7)+(9 x^{2} +6)[/tex]
First work out the parenthesis.
[tex] x^{2} -x+7+9 x^{2} +6[/tex]
Rearrange the expression.
[tex] x^{2} +9 x^{2} -x+7+6[/tex]
Now collect the terms.
[tex]10 x^{2} - x+13[/tex]
The answer is B.
~ Hope this helps you!
