If ax^2+bx+c does not have any real root and 4a+c<2b then the number of real roots of the equation x^4+3x^2-a=

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The equation $a x^{2} + b x + c$ = 0 does not have real roots and c < 0. Which of these is true?

c < 0

a x^{2} + b x + c = 0

9 a + 3 b + c < 0

The equation $a x^{2} + b x + c$ = 0 does not have real roots and c < 0. Which of these is true?

a x^{2} + b x + c = 0

(1, 2)

a

5 a + 2 b + c

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a, b, c

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