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09 Jul 2019, 03:58
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C
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Difficulty:
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Question Stats:
92% (01:22) correct
8%
(01:37)
wrong
based on 89
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\((2 + \sqrt{7}) (4 − \sqrt{7}) (−2x) =\)
(A) \(78x − 4x \sqrt{7}\)
(B) \(\sqrt{7}x\)
(C) \(−2x − 4x \sqrt{7}\)
(D) \(–2x\)
(E) \(4x \sqrt{7}\)
(A) \(78x − 4x \sqrt{7}\)
(B) \(\sqrt{7}x\)
(C) \(−2x − 4x \sqrt{7}\)
(D) \(–2x\)
(E) \(4x \sqrt{7}\)
09 Jul 2019, 06:33
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SajjadAhmad
\((2 + \sqrt{7}) (4 − \sqrt{7}) (−2x) = (1 + 2\sqrt{7})(-2x)\)
\(= -2x -4x\sqrt{7}\)
SajjadAhmad
\((2 + \sqrt{7}) (4 − \sqrt{7}) (−2x) =\)
\(=(8 +4 \sqrt{7} -2\sqrt{7}-7)(-2x)\)
\(=(1+2\sqrt{7})(-2x)\)
\(=-2x-4x\sqrt{7}\)
IMO C
