If , then

a) x=3

b) x=

c) x=6

d) x=9

Please tell the answer with complete explaination :)

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- March 30th 2009, 07:50 PMsiddscool19Problem based on square root
If , then

a) x=3

b) x=

c) x=6

d) x=9

Please tell the answer with complete explaination :) - March 30th 2009, 07:59 PMmollymcf2009
- March 30th 2009, 08:26 PMo_O
Let:

Now, note that if you square it and move +6 to the LHS:

But the RHS is again!

Thus, we see that is the positive solution to the quadratic:

which is simply 3. - March 30th 2009, 08:39 PMGaurav