Quadratic equation & Minus B

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Fergal Ahern 2019-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/462307-quadratic-equation-minus-b

回答： Pavi thra 2020-10-28

采纳的回答： kirti singh

How do I solve the quadratic equation ax^2+bx+c=0 using the minus b formula, x=-b+- sqrt b^2-4ac/2a on MATLAB

Thank you

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Fergal Ahern 2019-5-15

编辑：Fergal Ahern 2019-5-15

Geoff - The program must read in coefficients a,b and c from the keyboard and then calculate the roots of the equation. Do you know how I would verify that real roots are generated?

James Tursa 2019-5-15

To read coefficients from the keyboard, you could use the input function

https://www.mathworks.com/help/matlab/ref/input.html?searchHighlight=input&s_tid=doc_srchtitle

To see if a number is real, you could use the isreal function

https://www.mathworks.com/help/matlab/ref/isreal.html?searchHighlight=isreal&s_tid=doc_srchtitle

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Answer 1

kirti singh 2019-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/462307-quadratic-equation-minus-b#answer_375267

The following example code snippet works for accepting the coefficients a,b and c and calculating the roots and finding if they are real or not:

a1 = 'Enter value of a ';
a = input(a1)
b1= 'Enter value of b ';
b = input(b1)
c1= 'Enter value of c ';
c = input(c1)
x1 = (-b + sqrt(b^2 - (4 * a * c))) / (2 * a);
x2 = (-b - sqrt(b^2 - (4 * a * c))) / (2 * a);
t1=isreal(x1);
t2=isreal(x2);