To solve the question:
9a x 3 + 8a + 4 -11a
First we will apply the rule of BODMAS
By applying the rules, we will first multiply before adding or subtracting
27a + 8a + 4 - 11a
Then we re-arrange after multiplying
27a + 8a -11a + 4
we will add all the numbers with "a" variable
24a + 4