wolfram|alpha says this is false but doesnt

$\displaystyle \sqrt{36-4x^2} \Rightarrow 2\sqrt{9-x^2}$

trueq[sqrt(36-4x^2) equals 2 Sqrt[9 - x^2]] - Wolfram|Alpha

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- Oct 22nd 2013, 03:42 PMJonroberts74simplifying a radical
wolfram|alpha says this is false but doesnt

$\displaystyle \sqrt{36-4x^2} \Rightarrow 2\sqrt{9-x^2}$

trueq[sqrt(36-4x^2) equals 2 Sqrt[9 - x^2]] - Wolfram|Alpha - Oct 22nd 2013, 04:02 PMPlatoRe: simplifying a radical
On the other hand, look at this.

- Oct 22nd 2013, 04:06 PMemakarovRe: simplifying a radical
And this.

- Oct 22nd 2013, 04:07 PMJonroberts74Re: simplifying a radical
why would it state it as false? Because, something subtracting something it equals is zero.

- Oct 22nd 2013, 04:41 PMtopsquarkRe: simplifying a radical
And yet again. Obviously "trueq" is a bit titchy. Always trust your mind over a computer.

-Dan - Oct 22nd 2013, 04:44 PMPlatoRe: simplifying a radical