Marie K.

asked • 01/18/15

solve x^2+2x-3=0 by completing the square

x^2 +2x -3 =0  
 
solve by completing the square and then by quadratic formula

2 Answers By Expert Tutors

By:

Mary Ann F. answered • 01/18/15

Math & Science... Algebra and Geometry specialist

Mary Ann F.

using the quadratic formula to check just means plugging in the coefficients into the formula 
 
-b  ±  √b2 - 4ac
         2a
 
in your equation a = 1, b = 2 and c = -3
 
Can you plug in the values and see if you get the same result and Art and I gave you with the square completion? 
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01/18/15

Art B. answered • 01/18/15

Ph.D Chemical Engineer with 30+ years experience teaching Diff. Eqns.

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