in matlab (a computer application for coding)...

so this is the first question.... see below

19. The following problem spans several questions. First dene the function f(x) = 2x^2 +8x+7 symbolically. Assign to f(x).

I answered like it like this:

syms f(x)

f(x) = symfun(2*x^2+8*x+7, x)

there is no error however the following problem I try to compute the next problem (see below) like this

20. Calculate f(6)f(6) - f(6 + f(9)) + f(f(2)f(3)). Assign to p19.

syms x

f = f(6)f(6) - f(6 + f(9)) + f(f(2)f(3))

expand (f)

and all I get is errors.... so I can't go on and finish the last problems and they are all due this eveing at midnight can someone help please...

21. Use simplify to simplify f(1 - 4x^2 + 8x^3 - 7x^4). Assign to p20.

22. Use solve to solve f(x) = 7. Assign to p21. 23. Use solve to solve 4f(4x) = 5 + f(x + 4). Assign to p22.

24. The following problem spans several questions. First dene the function g(x) = 2/5+x symbolically. Assign to g(x).