Answer:
n²-7n-21
Explanation:
Given the expression:
[tex]\mleft(7n^2-6\mright)-(6n^2+9)-(7n+6)[/tex]First, open the brackets:
[tex]=7n^2-6-6n^2-9-7n-6[/tex]Next, bring the like terms together and simplify:
[tex]\begin{gathered} =7n^2-6n^2-7n-6-9-6 \\ =n^2-7n-21 \end{gathered}[/tex]
