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Line 91:
Line 91: + + + + + + + + + + +
→negative numbers
--[[User:Ed Poor|Ed Poor]] 15:18, 24 April 2007 (EDT)
--[[User:Ed Poor|Ed Poor]] 15:18, 24 April 2007 (EDT)
:That's using "brute force" - you have to know the answers to solve it.
:Try:
::<math>x^2 = 9</math> (given)
::<math>x = \pm \sqrt{9}</math> (take square root of both sides)
::<math>x = \pm 3</math> (looking up sqr(9) in table.
::Giving the same result you got.
::For clarity, apply the same technique to solve for ''x'' in <math>x^2 = y</math> - or, see [[Completing the square]]. [[User:Human|Human]] 15:23, 24 April 2007 (EDT)