Step-by-step explanation:
the answer is in the above image
Answer:
[tex]-12^{2}[/tex] + 9a - 5
combine like terms :
-7[tex]a^{2}[/tex] - 5[tex]a^{2}[/tex] = -12[tex]a^{2}[/tex]
+3a - (-6a) = 9a
-9 - (-4) = -5
