If `a,b in R` and `a^2-4b>=0` the equation `z^4+az^2+b=0` has four real roots if

If a,b,c in R and the quadratic equation x^(2)+(a+b)x+c=0 has no real roots then

If a, b in R , and the equation x^(2) + (a - b) x - a - b + 1 = 0 has real roots for all b in R , then a lies in the in terval

If a, b, c in R and the quadratic equation x^2 + (a + b) x + c = 0 has no real roots then

a, b, c in R, a!= 0 and the quadratic equation ax^2+bx+c=0 has no real roots, then

a,b,c in R,a!=0 and the quadratic equation ax^(2)+bx+c=0 has no real roots,then

a, b, c in R, a!= 0 and the quadratic equation ax^2+bx+c=0 has no real roots, then

20.Let a,b and c be real numbers such that 4a+2b+c=0 and ab>0, Then the equation ax^(2)+bx+c=0 has ( A) real roots (B) imaginary roots (C) exactly one root (D) roots of same sign

Statement -1 : The quadratic equation ax^(2)+bx+c=0 has real roots if (a+c)^(2) gt b^(2) , AA , a,b,c in R . and Statement -2 : The quadratic equation ax^(2) +bx+c=0 has real roots if b^(2) -4ac ge 0

Let a,b and c be real numbers such that 4a+2b+c=0 and ab gt 0 .Then the equation ax^2+bx+c=0 has (A) real roots (B) Imaginary roots (C) exactly one root (D) roots of same sign