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06 Jan 2021, 05:47
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E
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Difficulty:
35%
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Question Stats:
69% (01:41) correct
31%
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For which of the following values of c will there be only 1 distinct real solution to the equation 3x^2 + 8x + c = 0 ?
(A) 0
(B) 4 3/3
(C) 3 1/8
(D) 4 1/2
(E) 5 1/3
(A) 0
(B) 4 3/3
(C) 3 1/8
(D) 4 1/2
(E) 5 1/3
06 Jan 2021, 06:04
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A quadratic equation has exactly one solution if b^2=4ac.
Hence IMO the answer is E 5 1/3
Hence IMO the answer is E 5 1/3
07 Jan 2021, 03:18
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if b^2=4ac then c isn't 51/3 and if you substitute c as 51/3 I reckon we get non real roots and hence I feel c=31/8 is the only one that has real roots.
Do correct me if my approach isn't valid.
Do correct me if my approach isn't valid.
