﹙3t+2﹚²=6t+4
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﹙3t+2﹚²=6t+4﹙3t+2﹚²=6t+4﹙3t+2﹚²=6t+4﹙3t+2﹚²=6t+49t²＋12t＋4=6t＋49t²＋6t=0
﹙3t+2﹚²=6t+4
﹙3t+2﹚²=6t+4
﹙3t+2﹚²=6t+4
﹙3t+2﹚²=6t+4
9t²＋12t＋4=6t＋4
9t²＋6t=0
3t﹙3t＋2﹚=0
t=0,t=－2／3
﹙3t+2﹚²-2(3t+2)=0
3t+2=0或者3t+2=2
t=-2/3 t=0