Question

for a equation ax^2+bx+c,roots are alpha,beta which are equal to c then c=

1)-b/2a
2)-b/3a
3)b/ca
4)r/8

Answer 1

alpha , and beta are the roots of given quadratic equation .
ax² + bx + c =0

alpha + beta = -coefficient of x/coefficient of x²

but
alpha = beta = c

so,

alpha + beta = c + c = -b/a

c = -b/2a
so, option (1) is correct