how to solve equation without values

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Muhammad Kundi
Muhammad Kundi 2019-10-6
评论： Muhammad Kundi 2019-10-7
hi,
I just want to solve the following equation. Just the simplified form without values.
I mean I just want to do the following task:
X1= 2- 4a
X2=3- 4a
I just want to use these values in the following expression
Capture.JPG
and get the simplified equation with only "a" as the variable

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采纳的回答

Walter Roberson
Walter Roberson 2019-10-6
syms X1 X2 a
expr = 4*X1^2 - 4*X1*X2 + 2*X2^2;
new_expr = subs(expr, {X1, X2}, {2-4*a, 3-4*a});
simplify(new_expr)

更多回答（1 个）

the cyclist
the cyclist 2019-10-6
编辑：the cyclist 2019-10-6
I suggest you read the documentation about simplifying symblic expressions for the Symbolic Math Toolbox.

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