Incomplete answer to inequality

gg
87 ●5 ●6 ●14

Consider the following inequality:

Q - 1 < (2*x + 3) < 9

Ans - x lies between (-1, 3)

But sagemath is only returning x > -1 as the answer, which is incomplete. Why is that?

sage: 
sage: solve([ 1  < 2*x + 3 < 9 ], x)
[[x > -1]]
sage:

1 Answer

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3213 ●5 ●41 ●86

You need to provide a list of inequalities:

sage: solve([1 < 2*x + 3, 2*x + 3 < 9], x)
[[-1 < x, x < 3]]

Thanks its working now!

gg ( 2020-03-01 05:57:43 +0100 )edit

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Asked: 2020-02-29 15:30:57 +0100

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Last updated: Feb 29 '20