Answer:
211a+9x
Explanation:
first, calculate the exponents (the number times itself) of each number
9a +81a +121a+9x
the reason they are positive is that a negative times a negative equals a positive ex: -3 x -3 = 9
next, combine the coefficients
starting with the variable for a
9a+81a+121a= 211a
x has no other coefficients so it would remain 9x
so the simplified answer would be
211a+9x