標題:
Maths
發問:
最佳解答:
p = 10x - 4xy - 5x^2 - y^2 - 8 = -y^2 - 4xy - 4x^2 - x^2 + 10x - 25 + 25 - 8 = -(y + 2x)^2 - (x - 5)^2 + 17 When x = 5, and y = -2x = -10, p attains the maximum of 17
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If p = 10x - 4xy - 5x^2 - y^2 - 8 , where x and y are real numbers, find the largest value of p.最佳解答:
p = 10x - 4xy - 5x^2 - y^2 - 8 = -y^2 - 4xy - 4x^2 - x^2 + 10x - 25 + 25 - 8 = -(y + 2x)^2 - (x - 5)^2 + 17 When x = 5, and y = -2x = -10, p attains the maximum of 17
其他解答:
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