Evaluate fourth root of 8* fourth root of 8

$\sqrt[4]{8} \cdot \sqrt[4]{8}$

Combine using the product rule for radicals.

$\sqrt[4]{8 \cdot 8}$

Multiply $8$ by $8$ .

$\sqrt[4]{64}$

Rewrite $64$ as $2^{4} \cdot 4$ .

Factor $16$ out of $64$ .

$\sqrt[4]{16 (4)}$

Rewrite $16$ as $2^{4}$ .

$\sqrt[4]{2^{4} \cdot 4}$

Pull terms out from under the radical.

$2 \sqrt[4]{4}$

Rewrite $4$ as $2^{2}$ .

$2 \sqrt[4]{2^{2}}$

Rewrite $\sqrt[4]{2^{2}}$ as $\sqrt{\sqrt{2^{2}}}$ .

$2 \sqrt{\sqrt{2^{2}}}$

Pull terms out from under the radical, assuming positive real numbers.

$2 \sqrt{2}$

The result can be shown in multiple forms.

Exact Form:

$2 \sqrt{2}$

Decimal Form:

$2.82842712 \dots$