0=-y^2+28y+98

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Solution for 0=-y^2+28y+98 equation:


Simplifying
0 = -1y2 + 28y + 98

Reorder the terms:
0 = 98 + 28y + -1y2

Solving
0 = 98 + 28y + -1y2

Solving for variable 'y'.

Combine like terms: 0 + -98 = -98
-98 + -28y + y2 = 98 + 28y + -1y2 + -98 + -28y + y2

Reorder the terms:
-98 + -28y + y2 = 98 + -98 + 28y + -28y + -1y2 + y2

Combine like terms: 98 + -98 = 0
-98 + -28y + y2 = 0 + 28y + -28y + -1y2 + y2
-98 + -28y + y2 = 28y + -28y + -1y2 + y2

Combine like terms: 28y + -28y = 0
-98 + -28y + y2 = 0 + -1y2 + y2
-98 + -28y + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-98 + -28y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '98' to each side of the equation.
-98 + -28y + 98 + y2 = 0 + 98

Reorder the terms:
-98 + 98 + -28y + y2 = 0 + 98

Combine like terms: -98 + 98 = 0
0 + -28y + y2 = 0 + 98
-28y + y2 = 0 + 98

Combine like terms: 0 + 98 = 98
-28y + y2 = 98

The y term is -28y.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28y + 196 + y2 = 98 + 196

Reorder the terms:
196 + -28y + y2 = 98 + 196

Combine like terms: 98 + 196 = 294
196 + -28y + y2 = 294

Factor a perfect square on the left side:
(y + -14)(y + -14) = 294

Calculate the square root of the right side: 17.146428199

Break this problem into two subproblems by setting 
(y + -14) equal to 17.146428199 and -17.146428199.

Subproblem 1

y + -14 = 17.146428199 Simplifying y + -14 = 17.146428199 Reorder the terms: -14 + y = 17.146428199 Solving -14 + y = 17.146428199 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + y = 17.146428199 + 14 Combine like terms: -14 + 14 = 0 0 + y = 17.146428199 + 14 y = 17.146428199 + 14 Combine like terms: 17.146428199 + 14 = 31.146428199 y = 31.146428199 Simplifying y = 31.146428199

Subproblem 2

y + -14 = -17.146428199 Simplifying y + -14 = -17.146428199 Reorder the terms: -14 + y = -17.146428199 Solving -14 + y = -17.146428199 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + y = -17.146428199 + 14 Combine like terms: -14 + 14 = 0 0 + y = -17.146428199 + 14 y = -17.146428199 + 14 Combine like terms: -17.146428199 + 14 = -3.146428199 y = -3.146428199 Simplifying y = -3.146428199

Solution

The solution to the problem is based on the solutions from the subproblems. y = {31.146428199, -3.146428199}

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