I do not understand how they got K*= 40
From 40^3 = 40K^2
Answer : 40^3 = 40K^2
=> 40 * 40 * 40 = 40K^2
=> (40 * 40* 40) / 40 = K^2
=> 40 * 40 = K^2
=> 40^2 = K^2
=> K = √(40^2)
=> K = (40^2)^1/2
=> K = 40^(2 * 1/2)
=> K = 40
Thus here K = 40 comes from 40^3 = 40K.
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