Question

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Answer 1

$1)\frac{\sqrt{81\sqrt[7]{b} } }{\sqrt[14]{b} }=\frac{9\cdot\sqrt{\sqrt[7]{b} } }{\sqrt[14]{b} }=\frac{9\cdot\sqrt[14]{b} }{\sqrt[14]{b} } =\boxed9\\\\\\2)x+\sqrt{x^{2}-4x+4 } =x+\sqrt{(x-2)^{2} } =x+|x-2|=x+2-x=\boxed2$