[x-1]²-25=0 2[x+ 1]²=x² -1 Y²-2Y-3=0
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[x-1]²-25=0 2[x+ 1]²=x² -1 Y²-2Y-3=0
[x-1]²-25=0 2[x+ 1]²=x² -1 Y²-2Y-3=0
[x-1]²-25=0 2[x+ 1]²=x² -1 Y²-2Y-3=0
第一道,X=6((x-1)^2=25,得x-1=25)
第二道,x=-1,左侧分解因式得X^2+2x+1=x^2-1,化简可得
第三道,y=-1,y=3
[x-1]²-25=0
x-1=5或x-1=-5
x=6或x=-4
2[x+ 1]²=x² -1
2x²+4x+2=x²-1
x²+4x+3=0
(x+1)(x+3)=0
x=-1或x=-3
Y²-2Y-3=0
(y+1)(y-3)=0
y=-1或y=3
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