作业帮-3/20(x-4)²+3=0
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-3/20(x-4)²+3=0
-3/20(x-4)²+3=0
-3/20(x-4)²+3=0
-3/20(x-4)²+3=0
-3/20(x-4)²=-3
(x-4)²=20
x-4=±√20
x1=4+2√5 x2=4-2√5
解由-3/20(x-4)²+3=0
得3/20(x-4)²=3
即(x-4)²=20
即x-4=2√5或x-4=-2√5
解得x=4+2√5或x=4-2√5
-3/20(x-4)²+3=0
﹙x－4﹚²＝20
x－4＝±2√5
x1＝4＋2√5
x2＝4－2√5.