Answer :

konrad509
[tex]\sqrt{81x^4}=\sqrt{81}\cdot\sqrt{x^4}=9x^2[/tex]
[tex]\sqrt{81x^4}=\sqrt{81}\cdot\sqrt{x^4}=\sqrt{9^2}\cdot\sqrt{(x^2)^2}=\boxed{9x^2}\\\\use:\sqrt{a^2}=a\ where\ a \geq 0[/tex]

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