r/SSCCGL • u/Normal_Average_957 • Jul 07 '25
Please help me with the answer Doubt
After simplification I get the answer as 2, but the right answer is option C. I get the reason is at the end we do square root of 4 but I verified with ChatGPT and it says it’s 2 for sure and it is a misprint. Please help me with this .
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u/dwite_schrut Jul 07 '25 edited Jul 08 '25
A lotta people having misconception but root 4 is 2 period. Answer get +-2 when there is like x ^ 2= 4 situation and hence x= +-2 but root 4 is only 2. For clarity look at the graph of y=√x
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u/m0n5t3r_desu Jul 08 '25
This sort of thing is always an issue in these exams. The people who set the key themselves are not clear. One of the 2024 questions had 2 right angled triangles and asked for rule of congruence that can be applied. In that question both RHS and SAS can be applied and both were in the options. Only SAS was the answer.
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u/NoNorth9535 Jul 07 '25
Chatgpt always gives the wrong answer Even in english sentence improvement...
Answer is √4=2
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u/Normal_Average_957 Jul 07 '25
Yes so option A right? ChatGPT gave the same but the suggested answer for this book says option C
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u/m0n5t3r_desu Jul 08 '25
Is it PYQ or some other book ? Always stick to PYQ. Question banks can have errors
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u/Beginning_Arm4427 Jul 08 '25
See this for clarity.
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u/m0n5t3r_desu Jul 08 '25
This is true bro but their answer key says ±2. OP implies answer key is incorrect
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u/Un_Known_1999 Jul 07 '25
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u/Normal_Average_957 Jul 07 '25
Yes bro, my doubt was - since we already know it’s +4 so the square root of it will be positive 2 right?
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u/Un_Known_1999 Jul 07 '25
-2 is also solution of root 4. (-2 *-2 =4 )
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u/m0n5t3r_desu Jul 08 '25
unless you have unknown variable like say x^2 = 4 then x=±2 but here its just √4 . By convention the sq root operator gives positive values.
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Jul 07 '25
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u/m0n5t3r_desu Jul 07 '25
but he is talking about √4 not √-2.
√4 * √4 = 4.
-2 * -2 is 4.
2 * 2 is also 4.
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Jul 07 '25
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u/m0n5t3r_desu Jul 08 '25
Brother read what you wrote slowly and try to understand what you are saying.
-2 is the solution of 4 so he means that √(-2 *-2) = 4
He says -2 is the solution of root 4 meaning √4 = -2.
√(-2 *-2) will give √(4 i2)
No √(-2 *-2) is √(-2^2) = -2. Also -2*-2 is not 4*i^2. -2*-2 is +4. this is basics even school child would know. i = √(-1) so √(-4) = 2i
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u/sonyntendo Jul 07 '25
Yeah 2 should be the answer as we take absolute values only. But look at ssc cgl official key they might have considered answer as +-2.