设集合A={x丨x2+4x=0},B={x丨x2+2(m+1)x+m2-1=0}.若A∩B=B,求m的值?

问题描述:

设集合A={x丨x2+4x=0},B={x丨x2+2(m+1)x+m2-1=0}.若A∩B=B,求m的值?