2y^2+10y=-7

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Solution for 2y^2+10y=-7 equation:


Simplifying
2y2 + 10y = -7

Reorder the terms:
10y + 2y2 = -7

Solving
10y + 2y2 = -7

Solving for variable 'y'.

Reorder the terms:
7 + 10y + 2y2 = -7 + 7

Combine like terms: -7 + 7 = 0
7 + 10y + 2y2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
3.5 + 5y + y2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 5y + -3.5 + y2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 5y + y2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 5y + y2 = 0 + -3.5
5y + y2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
5y + y2 = -3.5

The y term is 5y.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5y + 6.25 + y2 = -3.5 + 6.25

Reorder the terms:
6.25 + 5y + y2 = -3.5 + 6.25

Combine like terms: -3.5 + 6.25 = 2.75
6.25 + 5y + y2 = 2.75

Factor a perfect square on the left side:
(y + 2.5)(y + 2.5) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(y + 2.5) equal to 1.658312395 and -1.658312395.

Subproblem 1

y + 2.5 = 1.658312395 Simplifying y + 2.5 = 1.658312395 Reorder the terms: 2.5 + y = 1.658312395 Solving 2.5 + y = 1.658312395 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + y = 1.658312395 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = 1.658312395 + -2.5 y = 1.658312395 + -2.5 Combine like terms: 1.658312395 + -2.5 = -0.841687605 y = -0.841687605 Simplifying y = -0.841687605

Subproblem 2

y + 2.5 = -1.658312395 Simplifying y + 2.5 = -1.658312395 Reorder the terms: 2.5 + y = -1.658312395 Solving 2.5 + y = -1.658312395 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + y = -1.658312395 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = -1.658312395 + -2.5 y = -1.658312395 + -2.5 Combine like terms: -1.658312395 + -2.5 = -4.158312395 y = -4.158312395 Simplifying y = -4.158312395

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.841687605, -4.158312395}

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