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Math problem with "completing the square"?
How do I solve
x^2 - 5x - 14 = 0
using the completing the square method?
1 Answer
- Mrs. HLv 61 decade agoFavorite Answer
x^2 - 5x - 14 = 0 Move your constant
x^2 -5x = 14 Take half of the x coefficient - 2.5 - square it 6.25 add it to both sides
x^2 - 5x + 6.25 = 14 + 6.25
x^2 - 5x + 6.25 = 20.25 Factor the left side
(x-2.5)^2 = 20.25 Square root both sides
x - 2.5 = +- 4.5
x - 2.5 = 4.5 and x - 2.5 = - 4.5
x = 4.5 + 2.5 and x = -4.5 + 2.5
x = 7 and x = -2
