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Writing a quadratic equation program to satisfy a solution. I am very confused help please.

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Reelz
Reelz 2012-4-14
I am trying to write a program in which two solutions, v and w, of the quadratic equation q(x) = ax^2 + bx +c = 0, that satisfies vw = c/a. I want this program to numerically solve such equations given a, b and c. The larger (abs solution) v using this quadratic formula, and the smaller w using w = c/(av), and of course having a provision for a = 0. I want my output to be a vector of solutions showing how many solutions exist. This relatively simple exercise is killing me because I cannot figure it out. Help greatly appreciated with explanation.
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Reelz
Reelz 2012-4-14
Here is what I have, I am confused on how to set up my parameters correctly.
function [x,y] = rqe2(a,b,c)
x = (-b + sqrt(b^2 - 4 * a * c))/(2*a);
y = (-b - sqrt(b^2 - 4 * a * c))/(2*a);
if vw = c/a;
w = c/(av);
v > w;
a==0;
end
Reelz
Reelz 2012-4-14
I get an error when trying to run that says this:
Error: File: rqe2.m Line: 4 Column: 7
The expression to the left of the equals sign is not a valid target for an assignment.

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回答（1 个）

Walter Roberson
Walter Roberson 2012-4-15
if vw = c/a;
is not a valid statement. The comparison operator is == rather than =
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Reelz
Reelz 2012-4-17
>> rqe2(5,9,15)
??? Error: File: rqe2.m Line: 4 Column: 7
The expression to the left of the equals sign is not a valid target for an
assignment.
Still receiving error!

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