If `a x^2+b x+c=0` has equal roots, then `c=` `-b/(2a)` (b) `b/(2a)` (c) `(-b^2)/(4a)` (d) `(b^2)/(4a)`

If ax^(2)+bx+c=0 has equal roots,then c=-(b)/(2a)(b)(b)/(2a)(c)(-b^(2))/(4a) (d) (b^(2))/(4a)

The value of c for which the equation a x^2+2b x+c=0 has equal roots is (b^2)/a (b) (b^2)/(4a) (c) (a^2)/b (d) (a^2)/(4b)

If a(b-c)x^(2)+b(c-a)x+c(a-b)=0 has equal root,then a,b,c are in

If the roots of the equation (a^2+b^2)x^2-2b(a+c)x+(b^2+c^2)=0 are equal, then 2b=a+c (b) b^2=a c (c) b=(2a c)/(a+c) (d) b=a c

If x_(1) and x_(2) are two distinct roots of the equation a cos x+b sin x=c, then tan((x_(1)+x_(2))/(2)) is equal to (a)(a)/(b) (b) (b)/(a) (c) (c)/(a) (d) (a)/(c)

If the equation |x^(2)+bx+c|=k has four real roots,then A.b^(2)-4c>0 and 0 0 and k>(4c-b^(2))/(4) D.none of these

If 2 is a root of the equation x^2+b x+12=0 and the equation x^2+b x+q=0 has equal roots, then q= (a) 8 (b) -8 (c) 16 (d) -16

If a and b are roots of the equation x^2+a x+b=0 , then a+b= (a) 1 (b) 2 (c) -2 (d) -1