9(x-1)^2=(7-x)^2
急用
快d答吾該
quadratic equations 1題好簡單
2010-10-14 3:31 am
回答 (1)
2010-10-14 3:39 am
✔ 最佳答案
9(x-1)^2 = (7-x)^2[3(x - 1)] ^2 = (7 - x)^2[3(x - 1)]^2 - (7 - x)^2 = 0(3x - 3)^2 - (7 - x)^2 = 0(3x - 3 + 7 - x) [3x - 3 - (7 - x)] = 0(2x + 4) (4x - 10) = 0x = -4/2 = - 2 or x = 10/4 = 5/2
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