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11 years ago
For yesterday puzzle only option 2 satisfy the condition.
X=4 only satisfy the condition.
x=1 not satisfy the equation.
Reason:
sqrt(2x^2-2x+1)
if you will put 1 here
sqrt(4-2+1) = sqrt(1) you cant take it as -1
Here the condition is clear that inside sqrt the value is positive.
only option 2 is correct and marks will not provide to other user who answer 3rd option.
you can take a variable like sqrt(y^2) as + - y. because its a variable and you dont know its -y or +y so you can take both but here in the question y is +1 so you can only consider y as +1.
There r few things whch we knw whch r nt capable of mathmatical reasoning nd when these can nt it is a sign dt our knowledge of them is very smal nd confusd nd where a mathmaticl reasing can be had . It is as dark a foly to make use a candle stick as to g