minus 2 x square - 5 x + 7
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−2x2+(−5)x+7Δx1x2=0↓=(−5)2−(4×(−2)×7)=25−(−56)=81↓=2×(−2)−(−5)+√81=−4−(−5)+9=−414=−3.5↓=2×(−2)−(−5)−√81=−4−(−5)−9=−4−4=1
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