求解 $$$\left(y - 6\right)^{2} + 81 = 102$$$ 關於 $$$y$$$ (實根)
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在區間 $$$\left(-\infty, \infty\right)$$$ 上解方程 $$$\left(y - 6\right)^{2} + 81 = 102$$$,求 $$$y$$$。
答案
實根
$$$y = \sqrt{21} + 6\approx 10.58257569495584$$$A
$$$y = 6 - \sqrt{21}\approx 1.41742430504416$$$A
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