x1 = -7 - √25/ 2·1 = -7 - 5/ 2 = -12/ 2 = -6
x2 = -7 + √25 /2·1 = -7 + 5 /2 = -2/ 2 = -1
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x1 = -7 - √25/ 2·1 = -7 - 5/ 2 = -12/ 2 = -6
x2 = -7 + √25 /2·1 = -7 + 5 /2 = -2/ 2 = -1