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14 Feb 2022, 08:15
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
75% (01:14) correct
25%
(01:59)
wrong
based on 214
sessions
History
Date
Time
Result
Not Attempted Yet
If \(\frac{8−x}{x+1} = x\), then \(x^2 + 2x − 3 =\)
A. -3
B. 1
C. 2
D. 5
E. Cannot be determined
A. -3
B. 1
C. 2
D. 5
E. Cannot be determined
14 Feb 2022, 08:18
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Asked: If \(\frac{8−x}{x+1} = x\), then \(x^2 + 2x − 3 =\)
\(\frac{8−x}{x+1} = x\)
8-x =x(x+1) = x^2 + x
x^2 + 2x - 8 = 0
x^2 + 2x - 3 = 5
IMO D
\(\frac{8−x}{x+1} = x\)
8-x =x(x+1) = x^2 + x
x^2 + 2x - 8 = 0
x^2 + 2x - 3 = 5
IMO D
kungfury42
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14 Feb 2022, 12:29
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\(\frac{8-x}{x+1} = x\)
\(8-x = x*(x+1)\)
\(8-x = x^2+x\)
\(x^2+2x = 8\)
Therefore, \(x^2+2x-3 = 8-3 = 5\) option D.
\(8-x = x*(x+1)\)
\(8-x = x^2+x\)
\(x^2+2x = 8\)
Therefore, \(x^2+2x-3 = 8-3 = 5\) option D.
