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If b^2ge4ac for the equations ax^4+bx^2+...

If `b^2ge4ac` for the equations `ax^4+bx^2+c=0` then all the roots of the equation will be real if

A

`bgt0,alt0,cgt0`

B

`blt0,agt0,cgt0`

C

`bgt0,agt0,cgt0`

D

`bgt0,alt0,clt0`

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The correct Answer is:
B, D
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PATHFINDER-QUADRATIC EQUATION AND EXPRESSION-QUESTION BANK
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  8. Let the roots of f(x)=xbe alpha and beta where f(x) is quadratic polyn...

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  11. ''

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  14. The even root of the equation greater than 2 of (x-2)^6+(x-4)^6 =64 is

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  15. If alpha and beta are the distinct roots of the equation x^2-p(x+1)-b=...

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  18. If P(x) = ax^2+bx+c, and Q(x) = -ax^2+dx+c, acne 0, then prove that P(...

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