Quote:
Originally Posted by abhishek_mumbai
dissa,
sqrt(x^2)= x
not +x and -x
sqrt(9) = 3
if x^2 = 9
then x can be +3 and -3..
I also got C..
jsloan,
are you sure that C is wrong.. and what is b/n in a.. I do not see b in the question.
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@ Abhishek,
x^2 = 9==> x = +/- sqrt (9) = +/- 3
y^2 = (x^2)==> y = sqrt(x^2) =+/-x
sqrt (x^2) = +/- x
PS: keep in mind; when we take sqrt of anything there are two solutions(+ or -)!!