MATLAB: Find all solutions of

doit4mehomeworkmmmno attempt

 4 x^3-x^2-15x=1

x = roots([4  -1  -15  -1])

Do I get credit for doing your homework for you?

syms x 
f = (x^2+1)*(x^3+3) ; 
df = diff(x) 
simplify(df)

syms x 
fplot(2*sin(x)-x)
grid on 
vpasolve(2*sin(x)==x,x,2)
vpasolve(2*sin(x)==x,x,-2)
vpasolve(2*sin(x)==x,x)

Remark: See the graph guess the nearest root and get the exact root results