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If x > 0, What is the least possible value of -2√(5x) + x + 9 ?

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Senior Manager
Joined: 18 Feb 2019
Posts: 280
Location: India
GMAT 1: 490 Q47 V13
GPA: 3.6
If x > 0, What is the least possible value of -2√(5x) + x + 9 ?  [#permalink]

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14 Apr 2019, 07:13
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Difficulty:

45% (medium)

Question Stats:

58% (02:05) correct 42% (01:44) wrong based on 19 sessions

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If x > 0, What is the least possible value of -2√(5x) + x + 9 ?

A. 0
B. 1
C. √5
D. 4
E. 9
Director
Joined: 18 Jul 2018
Posts: 825
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
If x > 0, What is the least possible value of -2√(5x) + x + 9 ?  [#permalink]

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14 Apr 2019, 10:41
1
x > 0.

Least value of $$-2\sqrt{5x}+x+9$$
for least value, we want to try to cancel 9. if we consider x as 5.
Then $$-2\sqrt{5x}+x+9$$ = $$-2\sqrt{25}+5+9$$ = -10+5+9 = 4.

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If x > 0, What is the least possible value of -2√(5x) + x + 9 ?   [#permalink] 14 Apr 2019, 10:41
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