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標題:
A question
發問:
Answer the question in a detailed manner. 1. 4k^(3/2) - 6k = 54
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最佳解答:
Let x = k1/2 4k3/2 - 6k = 54 4x3 - 6x2 = 54 2x3 - 3x2 - 27 = 0 (x - 3)(2x2 + 3x + 9) = 0 x = 3 k1/2 = 3 k = 9
其他解答:
Let x=k^(1/2) 4k^(3/2) - 6k = 54 4x^3 - 6x = 54 x(2x-3)=27 =>2x^2-3x-27=0 (2x-9)(x+3)=0 x=9/2 or -3 So k=81/4
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