For all x, the expression x~ is defined as x^2/2a^2. What is the value

Question

For all x, the expression x~ is defined as x^2/2a^2. What is the value of 5~ ?

(1) 2~ = 4

(2) 3~ = 9

gmatophobia · Answer

Given

x~ =  \frac{x^2 }{ 2a^2}

The only missing variable here is  a^2 . So if we can get relation between x and x~ for any number we can answer the question.

Each statement gives us a relation between x and x~. Hence the statements are individually sufficient.

Option D

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