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10 Apr 2018, 06:34
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
56% (01:22) correct
44%
(01:27)
wrong
based on 9
sessions
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If x^2 - 3x + k = -30, what is the value of k?
(1) 2 is an element of the solution set of the given equation.
(2) 5 is an element of the solution set of the given equation.
(1) 2 is an element of the solution set of the given equation.
(2) 5 is an element of the solution set of the given equation.
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10 Apr 2018, 09:10
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Bunuel
x^2 - 3x + k = -30
we need value of x to find the value of k
from 1:
x=2
we can find the value of k by replacing the value of x in given eq.
sufficient.
from 2:
x=5
we can find the value of k by replacing the value of x in given eq.
sufficient
hence D
shoumkrish
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10 Apr 2018, 09:47
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x^2 - 3x + k = -30
x^2 - 3x + (k + 30) = 0
sum of roots = 3
product of roots = (k+30)
1) 2 + a = 3 => a = 1.
So, k+30 = 2 => k = 28
2) 5 + b = 3 => b = -2.
So, k + 30 = -10 => k = -40
EIther sufficient.
(D)
x^2 - 3x + (k + 30) = 0
sum of roots = 3
product of roots = (k+30)
1) 2 + a = 3 => a = 1.
So, k+30 = 2 => k = 28
2) 5 + b = 3 => b = -2.
So, k + 30 = -10 => k = -40
EIther sufficient.
(D)
