y^2+2y-57=0

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Solution for y^2+2y-57=0 equation:


Simplifying
y2 + 2y + -57 = 0

Reorder the terms:
-57 + 2y + y2 = 0

Solving
-57 + 2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '57' to each side of the equation.
-57 + 2y + 57 + y2 = 0 + 57

Reorder the terms:
-57 + 57 + 2y + y2 = 0 + 57

Combine like terms: -57 + 57 = 0
0 + 2y + y2 = 0 + 57
2y + y2 = 0 + 57

Combine like terms: 0 + 57 = 57
2y + y2 = 57

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 57 + 1

Reorder the terms:
1 + 2y + y2 = 57 + 1

Combine like terms: 57 + 1 = 58
1 + 2y + y2 = 58

Factor a perfect square on the left side:
(y + 1)(y + 1) = 58

Calculate the square root of the right side: 7.615773106

Break this problem into two subproblems by setting 
(y + 1) equal to 7.615773106 and -7.615773106.

Subproblem 1

y + 1 = 7.615773106 Simplifying y + 1 = 7.615773106 Reorder the terms: 1 + y = 7.615773106 Solving 1 + y = 7.615773106 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 7.615773106 + -1 Combine like terms: 1 + -1 = 0 0 + y = 7.615773106 + -1 y = 7.615773106 + -1 Combine like terms: 7.615773106 + -1 = 6.615773106 y = 6.615773106 Simplifying y = 6.615773106

Subproblem 2

y + 1 = -7.615773106 Simplifying y + 1 = -7.615773106 Reorder the terms: 1 + y = -7.615773106 Solving 1 + y = -7.615773106 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -7.615773106 + -1 Combine like terms: 1 + -1 = 0 0 + y = -7.615773106 + -1 y = -7.615773106 + -1 Combine like terms: -7.615773106 + -1 = -8.615773106 y = -8.615773106 Simplifying y = -8.615773106

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.615773106, -8.615773106}

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