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If (2x + 1)^2 = 100, then which one of the following COULD e

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If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 18 Apr 2018, 12:02
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If \((2x + 1) ^2 = 100\), then which one of the following COULD equal x ?

(A) \(\frac{-11}{2}\)

(B) \(\frac{-9}{2}\)

(C) \(\frac{11}{2}\)

(D) \(\frac{13}{2}\)

(E) \(\frac{17}{2}\)
[Reveal] Spoiler: OA

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Re: If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 19 Apr 2018, 00:15
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Consider (2x + 1) as Y
We are given
Y^2 = 100
Therfore,
Y = + 10 or -10

That is
2x + 1 = 10
2x = 9
x = 9/2

OR

2x + 1 = -10
2x = -11
x = -11/2

Correct Answer: Option A
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Re: If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 17 Jul 2018, 12:36
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Carcass wrote:
If \((2x + 1) ^2 = 100\), then which one of the following COULD equal x ?

(A) \(\frac{-11}{2}\)

(B) \(\frac{-9}{2}\)

(C) \(\frac{11}{2}\)

(D) \(\frac{13}{2}\)

(E) \(\frac{17}{2}\)



Given

( 2x +1 )^2 = 100

2x + 1 = 10 or -10

So, x has to 2 different values.

2x +1 = 10

x = 9/2

or

2x + 1 = -10

2x = -11

x = -11/2.

Option A is our answer.
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Re: If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 02 Nov 2019, 07:11
Carcass wrote:
If \((2x + 1) ^2 = 100\), then which one of the following COULD equal x ?

(A) \(\frac{-11}{2}\)

(B) \(\frac{-9}{2}\)

(C) \(\frac{11}{2}\)

(D) \(\frac{13}{2}\)

(E) \(\frac{17}{2}\)


Official Explanation from Nova

Attachment:
Screenshot from 2019-11-02 21-11-26.png
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Re: If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 02 Nov 2019, 08:02
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Please Sir, type the explanation as text reply, not images.

Thank you
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Re: If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 02 Nov 2019, 08:10
Carcass wrote:
Please Sir, type the explanation as text reply, not images.

Thank you


It takes time coz the developers do not make it easy or simple to write. By the way, next time I will try, Thanks @Carcass.
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Re: If (2x + 1)^2 = 100, then which one of the following COULD e [#permalink] New post 02 Nov 2019, 08:13
Expert's post
How is not simple ??

when you type a reply upon the text box you do have the tag to create fraction or exponents. It is that simple :(

Show me what you wanna do for instance. I will help you
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Re: If (2x + 1)^2 = 100, then which one of the following COULD e   [#permalink] 02 Nov 2019, 08:13
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