Question

solve this problem question​

Answer 1

ANSWER:-

(d) c & a have same signs.

EXPLANATION:-

Roots of an equation can only be equal if

$\sqrt{ {b}^{2} - 4ac} = 0$

This is only possible if the signs of a & c are either both positive or both negative.

If one of them is positive and the other is negative, they will cancel out , i.e.,

-4×-(a×c)= +4ac

Thus reulting into an addition, which will never produce 0 as the answer.

Hope it helps.