√x-4 +√x+6
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$\sqrt{x} -4 +\sqrt{x} +6$
$2\sqrt{x} -4+6$
$2\sqrt{x} +2~~~→ (2(\sqrt{x} +1))$
(√x) - 4 + (√x) + 6 =
= 2 * (√x ) - 4 + 6 =
= 2 * (√x ) + 2 = (raccogliamo il 2a fattor comune);
= 2 * (√x + 1).
Ciao @davide73
http://www.wolframalpha.com/input?i=simplify+%E2%88%9Ax-4+--%E2%88%9Ax--6
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