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If z is different from zero
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19 Apr 2021, 12:44
19 Apr 2021, 12:44
Expert Reply
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Question Stats:
44% (02:30) correct
55% (02:38) wrong based on 9 sessions
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If \(z \neq 0\), and \(z=\sqrt{(8zs-16s^2)}\), then z =
A. \(s\)
B. \(4s\)
C. \(4s^2\)
D. \(- \frac{4s^2}{3}\)
E. \(-4s\)
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
A. \(s\)
B. \(4s\)
C. \(4s^2\)
D. \(- \frac{4s^2}{3}\)
E. \(-4s\)
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Re: If z is different from zero
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21 Apr 2021, 11:16
21 Apr 2021, 11:16
1
Expert Reply
Squaring both sides we do have
\(z^2=8zs-16s^2\)
\(z^2-8zs+16s^2=0\)
\((z-4s)^2=0\)
\(z-4s=0
\)
\(z=4s\)
B is the answer
\(z^2=8zs-16s^2\)
\(z^2-8zs+16s^2=0\)
\((z-4s)^2=0\)
\(z-4s=0
\)
\(z=4s\)
B is the answer
Re: If z is different from zero
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24 Feb 2022, 09:53
24 Feb 2022, 09:53
2
You should edit the equation:.... -16 s^2), not -16x^2). It makes us confused. Thanks
