Variable x must be of data type double. It is currently of type sym. Check where the variable is assigned a value.
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%W=3t^2+6t
%W=3t(t+2)
%(-(b)+sqrt(b^2-(4*a*c))/2*a)
%(-(b)-sqrt(b^2-(4*a*c))/2*a)
syms x positive
W=3*x.^2+6*x;
t1=solve(W == 3)
t2=solve(W == 9)
t3=solve(W == 45)
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Dyuman Joshi
2023년 10월 10일
Although Watler has given you a working solution, I suggest you take the free Introductory course - MATLAB Onramp tutorial to learn the essentials of MATLAB.
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