X的平方加4X
=(x+2)^2-4=0
(x+2)^2=4
x+2=2,或-2
所以x=0,或x=-4
猜你喜欢
- 1The students looked after the disabled all the year round as if they were their sons and daughters
- 2成语组成古诗
- 33.5等于几分之几
- 4青蛙妈妈和小青蛙一共捉40只害虫,青蛙妈妈捉的是小青蛙的4倍,青蛙妈妈和小青蛙各捉了多少只害虫
- 5the difference between of which and whose
- 6水汽达到饱和的条件
- 7如果方程y−43−8＝−y+2/2的解与方程4y-（3m+1）=6y+2m-1的解相同，求式子−m+1/m的值．
- 8怎样才能使纸拱承载更大的重量?说出道理
- 9一个直径8厘米,长2米的圆柱形铁皮通风管,沿着高线剪开得到一个长方形.这个长方形的长和宽各是多少米?
- 10a的0次方等于1怎么证明