exam Maths Puzzle Numerical Ability

Can you explain how to figure this problem (6±√8)/2 and provide answer ?
Thank You.

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exam Other Question
Find the quotient.
- 10/33 divided by 12







Thanks! Please work fast! Happy Holidays! So that zip codes may be machine readable, the postal service encodes them as a group five bars, some tall, some short, in groups osf five. In how many distinct ways can two tall and three short bars be arranged?