how to plot a graph of the equation (x^5)+(x^4​)+(x^3)+(9​*x^2)+8*x+​3

how to plot a graph of the equation (x^5)+(x^4)+(x^3)+(9*x^2)+8*x+3 in matlab, i have tried using the plot function but it is still not working out. i also need it in the range of -8<x<6

i have used x[-8:1:6] and y=(x^5)+(x^4)+(x^3)+(9*x^2)+8*x+3 plot (x,y,'r')

Answer 1

[Azzi Abdelmalek]

coeff=[1 1 1 9 8 3] % the coefficients of your polynomial
x=-8:0.1:6
y=polyval(coeff,x)
plot(x,y,'r')

Answer 2

[Sean de Wolski]

>> ezplot(' (x^5)+(x^4)+(x^3)+(9*x^2)+8*x+3')

Answer 3

[Joseph Cheng]

You'll need to include the element-wise power in your y equation. instead of just ^ you will need to use .^

y=(x.^5)+(x.^4)+(x.^3)+(9*x.^2)+8*x+3