Answer:
$170 million
Explanation:
First we must calculate the implied fair value of goodwill:
fair value of goodwill = Sanchez's fair value - Sanchez's asset valuation = $1,020 million - $900 million = $120 million
impairment loss = recorded goodwill - fair value of goodwill = $290 million - $120 million = $170 million
An impairment loss is a loss generated by the decline of an asset's fair value.