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If the equation x^(2)-cx + d= 0 has root...

If the equation `x^(2)-cx + d= 0` has roots equal to the fourth powers of the roots of `x^(2) + ax +b = 0`, where `a^(2) gt 4b`, then the roots of `x^(2)-4bx + 2b^(2)-c =0` will be

A

both real

B

both negative

C

both positive

D

one positive and one negative

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