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If x = 3 is one solution to the equation x2 + rx - 20 = 4, t

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If x = 3 is one solution to the equation x2 + rx - 20 = 4, t [#permalink]  30 Jul 2019, 03:11
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Question Stats:

83% (00:25) correct 16% (00:07) wrong based on 12 sessions
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
[Reveal] Spoiler: OA

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Re: If x = 3 is one solution to the equation x2 + rx - 20 = 4, t [#permalink]  06 Aug 2019, 09:25
replace the value of x as 3 to solve the eqn
9 + 3r - 20 = 4
or, 3r = 24-9
or, r = 15
or, r = 5
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Re: If x = 3 is one solution to the equation x2 + rx - 20 = 4, t   [#permalink] 06 Aug 2019, 09:25
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