Answers

2015-06-23T23:52:40+08:00
X²+14x-32=0 x²+14x=32 x²+14x+[1/2(14)]²=32+[1/2(14)]² x²+14x+49=32+49 x²+14x+49=81 (x+7)²=√81 x+7=+-9 x+7=9 x+7=-9 x=9 x=-9-7 x=2 x=-16
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