matlab find max and min of given equation

to write matlab code for this equation

f(a,y)= a^2y^2+3ya+4(a^2y-4y^4a)

df(a,y)/da=0

to find the value of constant =a from above equation

then substitute the value back to equation to find min value of F(y)

[Sarah Crimi]

I think you need to define a and y as symbols. I got this from the attached link.

syms a y
f= a^2y^2+3ya+4(a^2y-4y^4a)
df = diff(f, a)==0;
solve(df, a)

https://www.mathworks.com/matlabcentral/answers/63866-solving-equation-calculus-derivatives

[madhan ravi]

f = a^2*y^2+3*y*a+4*(a^2*y-4*y^4*a)