How can i solve and input this problem

e^x=8x-4 in MATLAB. It says to find all real solutions.

[Nate]

How do i input and solve this question on MATLAB?

[Star Strider]

Please visit MATLAB Academy.

One option is:

syms x 
f = exp(x) == 8*x-4

f = 

xval = solve(f)

xval = 

I leave the rest to you!

.

[Image Analyst]

Original question (I think) in case he edits it away like some others:

e^x=8x-4 in MATLAB. It says to find all real solutions.

Answer 1

[Mann Baidi]

Hi Nathaniel,

If you want to find the real solutions of a equation, we can use the function solve()

For the above equation, the code for finding the real solutions should be :

For knowing more about the solve() function you can go through the doumentation.

syms x   % Declare x as variable in the equation
eqn= exp(1)^x==8*x-4;   % State the equation exp(1) denotes e
sol= solve(eqn,x,'Real',true);  % using the solve function and keeping real as true
disp(sol);  % sol are the real solutions of the equation

Answer 2

[Sam Chak]

Hi @Nathaniel

I use a different example,

so that you can try to work on the solution yourself.

fun = @(x) exp(x) - (6*x.^2 - 3);
fplot(fun, [-1 5], 'linewidth', 2), grid on, xlabel('x')

x0  = -1;
xsol1 = fzero(fun, x0)

xsol1 = -0.7602

x0  = 1.5;
xsol2 = fzero(fun, x0)

xsol2 = 0.9692

x0  = 5;
xsol3 = fzero(fun, x0)

xsol3 = 4.9838