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If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is

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If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is [#permalink]

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New post 15 Feb 2017, 02:27
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A
B
C
D
E

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86% (00:46) correct 14% (00:17) wrong based on 39 sessions

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Re: If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is [#permalink]

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New post 15 Feb 2017, 02:54
Bunuel wrote:
If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is the value of y?

A. −12
B. −3
C. 3
D. 6
E. 12


Substitute x = 9 in the Quadratic equation .
81 - 9y + 27 = 0
y = 108/9
y = 12

Answer is E .
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Re: If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is [#permalink]

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New post 15 Feb 2017, 03:04
Bunuel wrote:
If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is the value of y?

A. −12
B. −3
C. 3
D. 6
E. 12


x^2 − yx + 27 = 0
If x = 9
81-9y+27=0
9y=108
y=12

Hence Option E is correct
Hit Kudos if you liked it 8-).
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Re: If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is [#permalink]

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New post 15 Feb 2017, 07:23
Bunuel wrote:
If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is the value of y?

A. −12
B. −3
C. 3
D. 6
E. 12


Plug in the value of x = 9 and check -

\(9^2 − 9y + 27 = 0\)

Or, \(9y = 108\)

So, y = 12

Hence, correct answer must be (E) \(y = 12\)
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Abhishek....

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If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is [#permalink]

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New post 15 Feb 2017, 15:10
Bunuel wrote:
If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is the value of y?

A. −12
B. −3
C. 3
D. 6
E. 12


we know 27 is a multiple of 9
27/9=3
we know signs of both numbers are negative
(x-9)(x-3)=x^2-12x+27=0
y=12
If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is   [#permalink] 15 Feb 2017, 15:10
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If x = 9 is one solution to the quadratic x^2 − yx + 27 = 0, what is

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