Question

Help with MATLAB.

EXERCISE 6 Ask user to enter the coefficients of a quadratic equation, Ax² + Bx + C = 0, i.e. A, B, and C, and calculate the roots of the equation using the quadratic formula, ., --B+VB? - 4AC 2A

i did like

input('enter the coefficients of a quadratic equation "Ax2 + Bx + C = 0"')
fx=(-B+sqrt(B^2+4*A*C))/(2*A);

i just dont know how i can ask the user to input three (A,B,C)?

thanks!

Answer 1

You have to take input as a vector . If you want to take all coefficients at once .

Code :

W NA we are taking coefficients as a vector 2 coeff = input('Enter the coefficients of quadratic equation Ax^2 +Bx + C :'); 3 Sassigning values in coeff to A,B,C 4 A = coeff (1); 5 B = coeff (2); 6 C = coeff (3); Root1 = (-B + sqrt((B^2) -4*A*C))/2*A; $from given formula 8 Root2 = (-B - sqrt((B^2) -4*A*C))/2*A; 9 fprintf('Rooti is %f\n', Root1); 0 fprintf('Root2 is 3f\n', Root2); O UW NEO L 00 Sin case if you want to print roots as complex numbers , USE THIS fprintf('Roots are .2f+%.2fj and. 2f+%.2fj\n', real (Rootl), imag (Rootl), real (Root2), imag (Root2))
Output :

>> quaddd Enter the coefficients of quadratic equation Ax^2 +Bx + C :(1 10 -24] Rooti is 2.000000 Root2 is -12.000000
Raw_code :

%we are taking coefficients as a vector
coeff = input('Enter the coefficients of quadratic equation Ax^2 +Bx + C :');
%assigning values in coeff to A,B,C
A = coeff(1);
B = coeff(2);
C = coeff(3);
Root1 = (-B + sqrt((B^2)-4*A*C))/2*A; %from given formula
Root2 = (-B - sqrt((B^2)-4*A*C))/2*A;
fprintf('Root1 is %f\n',Root1);
fprintf('Root2 is %f\n',Root2);

%in case if you want to print roots as complex numbers , USE THIS

%fprintf('Roots are %.2f+%.2fj and.2f+%.2fj\n',real(Root1),imag(Root1),real(Root2),imag(Root2))