
Mark M. answered 11/07/16
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Mathematics Teacher - NCLB Highly Qualified
ax2 + bx + c = 0
x2 + bx/a + c/a = 0 divide both sides by a
x2 + bx/a + (b/2a)2 + c/a = (b/2a)2 complete the square
(x + b/2a)2 + c/a = b2/4a2 left side as square
(x + b/2a)2 = b2/4a2 - c/a subtract c/a from both sides
(x + b/2a)2 = b2/4a2 - 4ac/4a2 LCD
(x + b/2a)2 = (b2 - 4ac) / 4a2 combine
x + b/2a = ±√(b2 - 4ac) / 2a take square root
x = (-b ± ±√(b2 - 4ac)) / 2a subtract b/2a form both sides
OMG it's the Quadratic Formula!

Mark M.
The 2a is a common denominator for the -b and the ±√( ).
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11/07/16
Jada M.
11/07/16