y^2+91y+98=0

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Solution for y^2+91y+98=0 equation:


Simplifying
y2 + 91y + 98 = 0

Reorder the terms:
98 + 91y + y2 = 0

Solving
98 + 91y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-98' to each side of the equation.
98 + 91y + -98 + y2 = 0 + -98

Reorder the terms:
98 + -98 + 91y + y2 = 0 + -98

Combine like terms: 98 + -98 = 0
0 + 91y + y2 = 0 + -98
91y + y2 = 0 + -98

Combine like terms: 0 + -98 = -98
91y + y2 = -98

The y term is 91y.  Take half its coefficient (45.5).
Square it (2070.25) and add it to both sides.

Add '2070.25' to each side of the equation.
91y + 2070.25 + y2 = -98 + 2070.25

Reorder the terms:
2070.25 + 91y + y2 = -98 + 2070.25

Combine like terms: -98 + 2070.25 = 1972.25
2070.25 + 91y + y2 = 1972.25

Factor a perfect square on the left side:
(y + 45.5)(y + 45.5) = 1972.25

Calculate the square root of the right side: 44.410021392

Break this problem into two subproblems by setting 
(y + 45.5) equal to 44.410021392 and -44.410021392.

Subproblem 1

y + 45.5 = 44.410021392 Simplifying y + 45.5 = 44.410021392 Reorder the terms: 45.5 + y = 44.410021392 Solving 45.5 + y = 44.410021392 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-45.5' to each side of the equation. 45.5 + -45.5 + y = 44.410021392 + -45.5 Combine like terms: 45.5 + -45.5 = 0.0 0.0 + y = 44.410021392 + -45.5 y = 44.410021392 + -45.5 Combine like terms: 44.410021392 + -45.5 = -1.089978608 y = -1.089978608 Simplifying y = -1.089978608

Subproblem 2

y + 45.5 = -44.410021392 Simplifying y + 45.5 = -44.410021392 Reorder the terms: 45.5 + y = -44.410021392 Solving 45.5 + y = -44.410021392 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-45.5' to each side of the equation. 45.5 + -45.5 + y = -44.410021392 + -45.5 Combine like terms: 45.5 + -45.5 = 0.0 0.0 + y = -44.410021392 + -45.5 y = -44.410021392 + -45.5 Combine like terms: -44.410021392 + -45.5 = -89.910021392 y = -89.910021392 Simplifying y = -89.910021392

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.089978608, -89.910021392}

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