2y^2-12y+21=0

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Solution for 2y^2-12y+21=0 equation:


Simplifying
2y2 + -12y + 21 = 0

Reorder the terms:
21 + -12y + 2y2 = 0

Solving
21 + -12y + 2y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
10.5 + -6y + y2 = 0

Move the constant term to the right:

Add '-10.5' to each side of the equation.
10.5 + -6y + -10.5 + y2 = 0 + -10.5

Reorder the terms:
10.5 + -10.5 + -6y + y2 = 0 + -10.5

Combine like terms: 10.5 + -10.5 = 0.0
0.0 + -6y + y2 = 0 + -10.5
-6y + y2 = 0 + -10.5

Combine like terms: 0 + -10.5 = -10.5
-6y + y2 = -10.5

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = -10.5 + 9

Reorder the terms:
9 + -6y + y2 = -10.5 + 9

Combine like terms: -10.5 + 9 = -1.5
9 + -6y + y2 = -1.5

Factor a perfect square on the left side:
(y + -3)(y + -3) = -1.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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