8√7. Since the square root of 4 is 2 you just keep dividing the number by 4 and multiplying 2 outside the radical until you get to a number not divisible by 4. (√448 = √[112*4] = 2√112) then (2√112 = 2√[28*4] = 4√28) then (4√28 = 2√[7*4] = 8√7)
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The square root of 20 simplified is ±4.5
The square root of 96 simplified is: 9.8
The square root of 828 simplified is 28.8
The square root of 65 cannot be simplified.
The square root of 58 simplified is 7.6 (7.61577311).