the square of 25 is: 5 x 5 = 25 so your answer is 5.
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√2/√10 = √(2/10) = √(1/5) = √(1x5/5x5) = (√5)/5
5*sqrt(5)/sqrt(2) = 5*sqrt(5/2) = 5*sqrt(2.5) = 7.91, approx.
2(q^2 - 5) or 2(q - the square root of 5)(q + the square root of 5)
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.