-y^2+3y=28

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Solution for -y^2+3y=28 equation:


Simplifying
-1y2 + 3y = 28

Reorder the terms:
3y + -1y2 = 28

Solving
3y + -1y2 = 28

Solving for variable 'y'.

Reorder the terms:
-28 + 3y + -1y2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 3y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
28 + -3y + y2 = 0

Move the constant term to the right:

Add '-28' to each side of the equation.
28 + -3y + -28 + y2 = 0 + -28

Reorder the terms:
28 + -28 + -3y + y2 = 0 + -28

Combine like terms: 28 + -28 = 0
0 + -3y + y2 = 0 + -28
-3y + y2 = 0 + -28

Combine like terms: 0 + -28 = -28
-3y + y2 = -28

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = -28 + 2.25

Reorder the terms:
2.25 + -3y + y2 = -28 + 2.25

Combine like terms: -28 + 2.25 = -25.75
2.25 + -3y + y2 = -25.75

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = -25.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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