Please use the "Evaluate a function" wizard in Algebrator to solve this problem. Enter the function "f(x)=2^2+8x" and request evaluate for x="(b-9)".

If necessary, please use one of the following links to obtain a free trial of the program:

Windows: https://www.softmath.com/tr/alg51win-tr-en.exe

Mac: https://www.softmath.com/tr/alg51mac-tr-en.dmg