求下列各式中x的值 (1)︳x+1 ︳=3 (2)︳x²+2 ︳=18
问题描述:
求下列各式中x的值 (1)︳x+1 ︳=3 (2)︳x²+2 ︳=18
答
(1)
x+1=±3
x=2或x=-4
(2)
x²+2≥2
则x²+2=18
x=±4