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已知命题P：复数z 1 =3-3i，复数 z 2 = m 2 -4m-10 m+2 +( m 2 -2m-12)i，(m∈R) ，z 1 +z 2 是虚数；命题Q：关于x的方程2x 2 -4（m-1）x+m 2 +7=0的两根之差的绝对值小于2．若P∧Q为真命题，求实数m的取值范围．
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