2y^2-9y+31-y^2+2y-1=0

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Solution for 2y^2-9y+31-y^2+2y-1=0 equation:


Simplifying
2y2 + -9y + 31 + -1y2 + 2y + -1 = 0

Reorder the terms:
31 + -1 + -9y + 2y + 2y2 + -1y2 = 0

Combine like terms: 31 + -1 = 30
30 + -9y + 2y + 2y2 + -1y2 = 0

Combine like terms: -9y + 2y = -7y
30 + -7y + 2y2 + -1y2 = 0

Combine like terms: 2y2 + -1y2 = 1y2
30 + -7y + 1y2 = 0

Solving
30 + -7y + 1y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + -7y + -30 + y2 = 0 + -30

Reorder the terms:
30 + -30 + -7y + y2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -7y + y2 = 0 + -30
-7y + y2 = 0 + -30

Combine like terms: 0 + -30 = -30
-7y + y2 = -30

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = -30 + 12.25

Reorder the terms:
12.25 + -7y + y2 = -30 + 12.25

Combine like terms: -30 + 12.25 = -17.75
12.25 + -7y + y2 = -17.75

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = -17.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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