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x^2=9 and y^2=5
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16 Nov 2020, 07:19
16 Nov 2020, 07:19
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56% (01:11) correct
43% (01:14) wrong based on 76 sessions
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\(x^2=9\) and \(y^2=5\)
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Kudos for the right solution and explanation
Source: 320 GRE Math Questions
Quantity A |
Quantity B |
\([2x+y]^2\) |
\(65\) |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Kudos for the right solution and explanation
Source: 320 GRE Math Questions
Re: x^2=9 and y^2=5
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16 Nov 2020, 23:50
16 Nov 2020, 23:50
1
x2=9 and y2=5.
x = + or - 3 and y = + or - √5.
|2x+y|^2 = (2x+y)^2 or (-2x - y)^2.
One case can be:
(2*3 + √5)^2 = 36 + 5 + 12√5 = 41 + 12 * 2.2 = 41 + 26.4 = 67.4. Quantity A is greater.
Another case:
((-2 *-3) - √5)^2 = (6-√5)^2 = 36 + 5 - 2*6*√5 = 41 - 26.4 = 14.6. Quantity B is greater.
Therefore correct option is D.
x = + or - 3 and y = + or - √5.
|2x+y|^2 = (2x+y)^2 or (-2x - y)^2.
One case can be:
(2*3 + √5)^2 = 36 + 5 + 12√5 = 41 + 12 * 2.2 = 41 + 26.4 = 67.4. Quantity A is greater.
Another case:
((-2 *-3) - √5)^2 = (6-√5)^2 = 36 + 5 - 2*6*√5 = 41 - 26.4 = 14.6. Quantity B is greater.
Therefore correct option is D.
gmatclubot
Re: x^2=9 and y^2=5 [#permalink]
16 Nov 2020, 23:50
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