Question 171564
I guess this is what you are trying to express:

b^3 + 8^2 - (3b - 24)

Simplify one step at a time.

b^3 + 64 - 3b + 24

Combine like terms.

(b^3 - 3b) + (64 + 24)

Factor the quantity (b^3 - 3b).

So, (b^3 - 3b) becomes b(b^2 - 3).

Of course, 64 + 24 = 88.

We now put it all together.

b(b^2 - 3) + 88

This is the answer based on what you typed.