SAT Math Question of the Day

Math Category: Roots Level 2:

Q: √ 2  × √ 8

  1. 1
  2. 2
  3. 2 √ 2
  4. 4
  5. 4 √ 2

UNANSWERED.

The correct answer is D.

A: The answer is 4.
√ a  × √ b  = √ (a × b)
√ 2  × √ 8  = √ (2 × 8)  = √ 16  = 4