$\"\"$

The equation is $\"\"$ .

Rewrite the equation as $\"\"$ .

Apply one-to-one property : $\"\"$ if and only if $\"\"$ .

$\"\"$

Option (a) is not a solution of $\"\"$ .

Option (b) is an approximate solution of $\"\"$ . $\"\"$

Option (b) is an approximate solution of $\"\"$ .