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mLine 91:
Line 91: − + − +
→Completing the square: ditto
We can now take the square root:
We can now take the square root:
::<math>x - 5/2 = +- 1/2\,</math>
::<math>x - 5/2 = \pm 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 \pm 1/2\,</math>
Since 5/2 + 1/2 = 3, and 5/2 - 1/2 = 2, this is equivalent to the result obtained through factoring.
Since 5/2 + 1/2 = 3, and 5/2 - 1/2 = 2, this is equivalent to the result obtained through factoring.