Answer
See examples below
Work Step by Step
A) $x^9=2$ and $(x+8)^7=2$ and $2x^{23}=43$
B) Just square root each side and consider both positive and negative roots.
$x=\sqrt {15}$ and$x=-\sqrt {15}$
C) Cube root both sides and we get only 1 real solution.
$x=\sqrt[3] {15}$
