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If x = 3 is one solution to the equation x^2 + rx - 20 = 4, then r =

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If x = 3 is one solution to the equation x^2 + rx - 20 = 4, then r =  [#permalink]

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New post 03 Aug 2019, 22:27
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

92% (00:40) correct 8% (00:53) wrong based on 25 sessions

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Joined: 11 Sep 2015
Posts: 4886
Location: Canada
GMAT 1: 770 Q49 V46
Re: If x = 3 is one solution to the equation x^2 + rx - 20 = 4, then r =  [#permalink]

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New post 05 Aug 2019, 09:13
Top Contributor
Bunuel wrote:
If x = 3 is one solution to the equation \(x^2 + rx - 20 = 4\), then r =

(A) -8

(B) -5

(C) -3

(D) 5

(E) 8


If x = 3 is one solution to the equation x² + rx - 20 = 4, we can plug in x = 3 to get: 3² + r(3) - 20 = 4
Simplify: 9 + 3r - 20 = 4
Simplify: 3r - 11 = 4
Add 11 to both sides: 3r = 15
Solve: r = 15/3 = 5

Answer: D

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Brent
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Re: If x = 3 is one solution to the equation x^2 + rx - 20 = 4, then r =   [#permalink] 05 Aug 2019, 09:13

If x = 3 is one solution to the equation x^2 + rx - 20 = 4, then r =

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