51=-y^2+4y

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Solution for 51=-y^2+4y equation:


Simplifying
51 = -1y2 + 4y

Reorder the terms:
51 = 4y + -1y2

Solving
51 = 4y + -1y2

Solving for variable 'y'.

Reorder the terms:
51 + -4y + y2 = 4y + -4y + -1y2 + y2

Combine like terms: 4y + -4y = 0
51 + -4y + y2 = 0 + -1y2 + y2
51 + -4y + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
51 + -4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-51' to each side of the equation.
51 + -4y + -51 + y2 = 0 + -51

Reorder the terms:
51 + -51 + -4y + y2 = 0 + -51

Combine like terms: 51 + -51 = 0
0 + -4y + y2 = 0 + -51
-4y + y2 = 0 + -51

Combine like terms: 0 + -51 = -51
-4y + y2 = -51

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = -51 + 4

Reorder the terms:
4 + -4y + y2 = -51 + 4

Combine like terms: -51 + 4 = -47
4 + -4y + y2 = -47

Factor a perfect square on the left side:
(y + -2)(y + -2) = -47

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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