Question

Anyone a math Genius? simplify each radical expression. -21_/27x^9

Answer 1

Ok so according to comments, question is
$-21\sqrt{27x^{9}}$
remember that
$\sqrt{xy}$=$\sqrt{x}$ times $\sqrt{y}$
and $\sqrt{yx^{2}}$=$x\sqrt{y}$
so
$-21\sqrt{27x^{9}}$=$-21\sqrt{27}\sqrt{x^{9}}$ = $-21\sqrt{9}\sqrt{3}\sqrt{x^{2}}\sqrt{x^{2}}\sqrt{x^{2}}\sqrt{x^{2}}\sqrt{x}$= $-21(3)\sqrt{3}(x)(x)(x)(x)\sqrt{x}$=
$-63x^{4}\sqrt{3}\sqrt{x}$=$-63x^{4}\sqrt{3x}$