Question 818171

How do you Factor out 

sqrt(4x^4+36x^2+81) to equal  2x^2+9 ?

<pre>
{{{sqrt(4x^4 + 36x^2 + 81)}}}
{{{sqrt((2x^2 + 9)(2x^2 + 9))}}} ------ Factoring radicand
{{{sqrt((2x^2 + 9))^2}}}_____{{{highlight_green(2x^2 + 9)}}} ----- Square root and square cancel each other
You can do the check!! 

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