Please advise if this answer is correct:

-3a8^b2^c3^ (5abc9^ -11a^b4^c6^)

-3a8^b2^c3^ (-6ab3^c3^)

18a9^b5^c6^ - is this answer correct?

Thank you

No idea, please look at my reply to your previous question.

Your syntax is cockeyed

Correct the typos and try again

a^b4^c6^ is gibberish
a8^b2^c3^ is gibberish

What does 6^ mean?

Ah. Maybe you mean

-3a^8 b^2 c^3 (5abc^9 -11a^ b^4 c^6)

At this point I have to stop. I can't parse the 2nd factor.

To simplify the expression (-3a8^b2^c3^) * (5abc9^-11a^b4^c6^), we need to multiply the coefficients and combine the variables with the same base.

Let's begin by multiplying the coefficients:

(-3) * (5) = -15

Now let's simplify the variables with the same base (a, b, and c):

a * a = a^2
8^b * b = 8^b+1
2^c * 9^-11 = 2^c/9^11
c * c * 4^c = c^2 * 4^c

Now we can rewrite the expression:

-15a^2 * 8^b+1 * 2^c/9^11 * c^2 * 4^c

To simplify further, we need to combine the terms with the same base.

For variables with the same base, we add their exponents:

8^b+1 * 4^c = 8^b+1+c

For the term 2^c/9^11, we cannot simplify it any further without knowing the values of c and 9.

Therefore, the simplified expression is:

-15a^2 * 8^b+1+c * 2^c/9^11 * c^2