yagirlbrooke yagirlbrooke

26-02-2018
Mathematics

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Solve the quadratic equation by completing the square x^2+6x-5=0

Solve the quadratic equation by completing the square x26x50 class=

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sqdancefan sqdancefan

09-03-2018

x^2 +6x -5 = 0
x^2 +6x = 5 . . . . . add 5
x^2 +6x +9 = 14 . . . add 9
(x +3)^2 = 14 . . . . . . write left side as square
x +3 = ±√14 . . . . . . . take the square root
x = -3 ±√14 . . . . . . . subtract 3

Selection C is appropriate.

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