rewrite using a single exponent. \n$(4^{7})^{3}$

Explanation:

Step1: Apply power of a power rule

Recall the exponent rule: $(a^m)^n = a^{m \times n}$

Step2: Multiply the exponents

$4^{7 \times 3} = 4^{21}$

Answer:

$4^{21}$