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mLine 93:
Line 93: − +
→Completing the square: plus or minus symbol
::<math>x - 5/2 = +- 1/2\,</math>
::<math>x - 5/2 = +- 1/2\,</math>
The "+-" indicates that the 1/2 is either positive or negative. The result is thus
The "±" indicates that the 1/2 is either positive or negative. The result is thus
::<math>x = 5/2 +- 1/2\,</math>
::<math>x = 5/2 +- 1/2\,</math>