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- bobbym
- 2012-12-20 20:31:14
Hi;
Yes, it always takes the principal value.
- anonimnystefy
- 2012-12-20 20:25:17
Even when you got √2x-1 = -8 you could've said that there are no solutions, because a square root of a positive number is always positive...
- bob bundy
- 2012-12-20 19:45:43
hi Frublox
That answer is the solution to
-12 + √(2x-1) = -4
When you square you cannot help but introduce 'solutions' to this alternative equation as well so you were right to check the value you had.
Bob
- bobbym
- 2012-12-20 13:21:46
Hi Frublox;
That is correct, there are no solutions. Not every equation is a true statement. You always check the validity of your answer by plugging into the original equation.
Please go here:
http://www.mathsisfun.com/algebra/radic … lving.html
- Frublox
- 2012-12-20 12:01:58
Got this problem on a test:
____
12 + √2x-1 = 4
Okay, so then I subtract 12 from both sides:
____
√2x-1 = -8
2x - 1 = 64 I then square both sides...
2x = 65 Add 1 to each side
x = 65/2 Divide both sides by two.
However, that answer doesn't work. Are there simply no solutions, then?