Question

please answer my question
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Answer 1

Answer:

option a because it is correct

Answer 2

Answer:

(c) c and a have same signs

Step-by-step explanation:

If roots are equal the discriminant D would be 0

Hence, b^2-4ac=0 or b^2=4ac

Now b^2 is always positive hence 4ac will also be positive hence ac has to be positive for which a and c must have the same sign.

If you are unsure about these questions try substituting

Eg: (x+1)^2= x^2+2x+1

      (x-1)^2= x^2-2x+1

Clearly in both the only option that satisfies is:

(c) c and a have same signs