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find x given y

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Jarrod
Jarrod 2023-10-10
回答： Walter Roberson 2023-10-10
%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
W=3*x.^2+6*x;
t1a=solve(3*x.^2+6*x == 3);
t2a=solve(3*x.^2+6*x == 9);
t3a=solve(3*x.^2+6*x == 45);
this is what i have right now but i only want the possitive x value

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采纳的回答

Walter Roberson
Walter Roberson 2023-10-10
Ran in:
syms x positive
W=3*x.^2+6*x;
t1a=solve(W == 3)
t1a = 
t2a=solve(W == 9)
t2a = 
1
t3a=solve(W == 45)
t3a = 
3

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