MATLAB: I want to write a code where equation is y=x*x. if y=100 what is the value of x

if loop

i have written 
z=100; 
for x=1:1:20 
    y=x*x 
    if y==z 
        fprintf(x) 
    end 
end

Best Answer

>> f = @(x) x.^2 - 100;
>> x = fzero(f,pi)
x =  10
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