If I want to cancel a square a.k.a 4^2 do I multiply or add it to the square route of said number (4 here)

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- Jan 8th 2010, 12:05 PMMukilabSquares and routes
If I want to cancel a square a.k.a 4^2 do I multiply or add it to the square route of said number (4 here)

- Jan 8th 2010, 12:10 PMmr fantastic
- Jan 8th 2010, 12:14 PMpickslides
You don't add or multiply the square root, you 'take' the square root.

I.e you may have $\displaystyle x^2 = 81$ and you want to find $\displaystyle x$

which is the same as

$\displaystyle x^2 = 9^2$

now you can see you can take the square root of both sides.

$\displaystyle \sqrt{x^2} = \sqrt{9^2}$

which in turns yields

$\displaystyle x = 9$

As square and square root are opposites.

Now go ahead and change the world! - Jan 8th 2010, 12:15 PMMukilab
- Jan 8th 2010, 12:27 PMpickslides
- Jan 8th 2010, 12:35 PMMukilab
- Jan 8th 2010, 12:42 PMmr fantastic