4, -4
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In radical form, it is √256 But 256 = 28 so √256 = √(28) = 24 = 16
√32 = √(16 x 2)= √16 x √2= 4 √2
√1904 = √(16 x 119) =√16 x √119 = 4 √119
4 over square root of 16 simplifies to 1 !
sqrt(112) = sqrt(16 x 7) = sqrt(16) x sqrt(7) = 4 sqrt(7)