2（x+3）²=x²-9 用公式法解方程
人气：175 ℃ 时间：2020-03-23 06:42:34
解答
解由2（x+3）²=x²-9
得2x^2+12x+18=x^2-9
即x^2+12x+27=0
其Δ=12^2-4*37=36
故解得x=（-12+√36）/2或x=（-12-√36）/2
解得x=-3或x=-9.
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