y^2-y-58=0

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Solution for y^2-y-58=0 equation:


Simplifying
y2 + -1y + -58 = 0

Reorder the terms:
-58 + -1y + y2 = 0

Solving
-58 + -1y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '58' to each side of the equation.
-58 + -1y + 58 + y2 = 0 + 58

Reorder the terms:
-58 + 58 + -1y + y2 = 0 + 58

Combine like terms: -58 + 58 = 0
0 + -1y + y2 = 0 + 58
-1y + y2 = 0 + 58

Combine like terms: 0 + 58 = 58
-1y + y2 = 58

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 58 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 58 + 0.25

Combine like terms: 58 + 0.25 = 58.25
0.25 + -1y + y2 = 58.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 58.25

Calculate the square root of the right side: 7.632168761

Break this problem into two subproblems by setting 
(y + -0.5) equal to 7.632168761 and -7.632168761.

Subproblem 1

y + -0.5 = 7.632168761 Simplifying y + -0.5 = 7.632168761 Reorder the terms: -0.5 + y = 7.632168761 Solving -0.5 + y = 7.632168761 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 7.632168761 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 7.632168761 + 0.5 y = 7.632168761 + 0.5 Combine like terms: 7.632168761 + 0.5 = 8.132168761 y = 8.132168761 Simplifying y = 8.132168761

Subproblem 2

y + -0.5 = -7.632168761 Simplifying y + -0.5 = -7.632168761 Reorder the terms: -0.5 + y = -7.632168761 Solving -0.5 + y = -7.632168761 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -7.632168761 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -7.632168761 + 0.5 y = -7.632168761 + 0.5 Combine like terms: -7.632168761 + 0.5 = -7.132168761 y = -7.132168761 Simplifying y = -7.132168761

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.132168761, -7.132168761}

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