It is the same as the square root of 4 so it is 2
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Expressing any number to the power of a half is the same as giving the square root of the number. In this instance 41/2 = sqrt(4) = 2.
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Take its square root. All fractional exponents indicate roots. For example, the power 22 = 4, so sq rt 4 = (4)½ = (22)½ = (2)1 = 2
1/4 (1/2) squared = 1/2 x 1/2 = 1/4
Square root of 40 can be written as 49 to the power of half. So, the 2 in the half gets cancelled with the 4 leaving 49 square. And 49 square is 2401.