Answer
$2x+3$; $8$
Work Step by Step
RECALL:
$(a^{\frac{1}{3}})^3=a$
Cube both sides of the equation to obtain:
$\left((2x+3)^{\frac{1}{3}}\right)^3=2^3
\\\left((2x+3)^{\frac{1}{3}}\right)^3=8
$
Use the rule above to obtain:
$2x+3=8$
Thus, the missing expressions in the given statements are $2x+3$ and $8$, respectively
