解方程: (1)x2+4x+3=0 (2)3x2-5x-2=0.
问题描述:
解方程:
(1)x2+4x+3=0
(2)3x2-5x-2=0.
答
(1)x2+4x+3=0
(x+1)(x+3)=0,
故x+1=0或x+3=0,
解方程得:x1=-1,x2=-3;
(2)3x2-5x-2=0,
(x-2)(3x+1)=0,
即x-2=0,或3x+1=0,
解方程得:x1=2,x2=-
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