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LET the equation ax^2+bx+c=0 has no real...

LET the equation `ax^2+bx+c=0` has no real roots Assertion (A): `c(a+b+c)gt0`, Reason (R): A quadratic expression `ax^2+bx+c ` has signs same as that of al for all real x if the roots of the corresponding equation `ax^2+bx+c=0` are imaginary. (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not te correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

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The quadratic equation ax^(2)+bx+c=0 has real roots if:

If both the roots of the equation ax^(2) + bx + c = 0 are zero, then