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OpenStudy (anonymous):
Solve x2 + 6x + 7 = 0.
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jhonyy9 (jhonyy9):
x_1,_2=(-6+/- sqrt(36-28))/2 =(-6+/- sqrt8)/2 =-3+/- sqrt2
jhonyy9 (jhonyy9):
ok ?
jhonyy9 (jhonyy9):
because sqrt8 = 2sqrt2
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