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29 Mar 2024, 12:20
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
0% (00:00) correct
100%
(01:46)
wrong
based on 2
sessions
History
Date
Time
Result
Not Attempted Yet
\(-0.05 + 0.000025 + 25 = \)
A. \(4.995^2\)
B. \(4.95^2\)
C. \(4.5^2\)
D. \(-4.95^2\)
E. \(-4.995^2\)
A. \(4.995^2\)
B. \(4.95^2\)
C. \(4.5^2\)
D. \(-4.95^2\)
E. \(-4.995^2\)
29 Mar 2024, 12:20
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Official Solution:
\(-0.05 + 0.000025 + 25 = \)
A. \(4.995^2\)
B. \(4.95^2\)
C. \(4.5^2\)
D. \(-4.95^2\)
E. \(-4.995^2\)
Recognize that we have the square of the difference:
\(-0.05 + 0.000025 + 25 = \)
\(=-2*0.005*5 + 0.005^2+5^2=\)
\(=(0.005 - 5)^2=\)
\(=4.995^2\)
Answer: A
\(-0.05 + 0.000025 + 25 = \)
A. \(4.995^2\)
B. \(4.95^2\)
C. \(4.5^2\)
D. \(-4.95^2\)
E. \(-4.995^2\)
Recognize that we have the square of the difference:
\(-0.05 + 0.000025 + 25 = \)
\(=-2*0.005*5 + 0.005^2+5^2=\)
\(=(0.005 - 5)^2=\)
\(=4.995^2\)
Answer: A
02 Oct 2024, 22:22
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This is a very good question Bunuel
1 doubt - How can we understand that this question could be manipulated to the form (a-b)^2 at the first instance? Is this manipulation is something that comes by practice or is there any methodology or tips do you have to easily identify this?
Thanks a lot in advance!
1 doubt - How can we understand that this question could be manipulated to the form (a-b)^2 at the first instance? Is this manipulation is something that comes by practice or is there any methodology or tips do you have to easily identify this?
Thanks a lot in advance!
Bunuel
Official Solution:
\(-0.05 + 0.000025 + 25 = \)
A. \(4.995^2\)
B. \(4.95^2\)
C. \(4.5^2\)
D. \(-4.95^2\)
E. \(-4.995^2\)
Recognize that we have the square of the difference:
\(-0.05 + 0.000025 + 25 = \)
\(=-2*0.005*5 + 0.005^2+5^2=\)
\(=(0.005 - 5)^2=\)
\(=4.995^2\)
Answer: A
\(-0.05 + 0.000025 + 25 = \)
A. \(4.995^2\)
B. \(4.95^2\)
C. \(4.5^2\)
D. \(-4.95^2\)
E. \(-4.995^2\)
Recognize that we have the square of the difference:
\(-0.05 + 0.000025 + 25 = \)
\(=-2*0.005*5 + 0.005^2+5^2=\)
\(=(0.005 - 5)^2=\)
\(=4.995^2\)
Answer: A
