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If x=10^-1 what is the value of (3+x)(3-x)(1/x) ?
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18 Nov 2020, 10:18
18 Nov 2020, 10:18
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Question Stats:
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4% (00:50) wrong based on 25 sessions
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Re: If x=10^-1 what is the value of (3+x)(3-x)(1/x) ?
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18 Nov 2020, 13:42
18 Nov 2020, 13:42
1
Carcass wrote:
If \(x=10^{-1}\) what is the value of \((3+x)(3-x)(\frac{1}{x})\) ?
\(x = \frac{1}{10}\)
\((3 + \frac{1}{10})(3 - \frac{1}{10}) * (\frac{1}{\frac{1}{10}} )\)
Since \((x+y)*(x-y) = (x^2 - y^2)\)
Therefore we get, \(( 3^2 - (\frac{1}{10})^2 ) * (10)\)
\((9 - \frac{1}{100}) * 10\)
\((\frac{899}{100}) * 10\)
Ans: 89.9
gmatclubot
Re: If x=10^-1 what is the value of (3+x)(3-x)(1/x) ? [#permalink]
18 Nov 2020, 13:42
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