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Winston Ho
Mathematics
7 May, 09:15
Solve by completing the square x^2+6x+3=0
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Kaylynn
7 May, 09:39
0
X²+6x + ___ = - 3 + ___
The blank is equal to (b/2) ², which is, in this case, 9. However, I would leave it as (3) ² on the left in order to re-write it.
X²+6x + (3) ²=6
(X+3) ²=6
See how the 3 dropped down?
X-3=±√ (6)
X=3±√ (6)
Note: Whenever you take the square root of something, you must include a ± because, for example, 2² = (-2) ² and you must account for all possible answers.
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