2y^2+5y-35=0

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Solution for 2y^2+5y-35=0 equation:


Simplifying
2y2 + 5y + -35 = 0

Reorder the terms:
-35 + 5y + 2y2 = 0

Solving
-35 + 5y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-17.5 + 2.5y + y2 = 0

Move the constant term to the right:

Add '17.5' to each side of the equation.
-17.5 + 2.5y + 17.5 + y2 = 0 + 17.5

Reorder the terms:
-17.5 + 17.5 + 2.5y + y2 = 0 + 17.5

Combine like terms: -17.5 + 17.5 = 0.0
0.0 + 2.5y + y2 = 0 + 17.5
2.5y + y2 = 0 + 17.5

Combine like terms: 0 + 17.5 = 17.5
2.5y + y2 = 17.5

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = 17.5 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = 17.5 + 1.5625

Combine like terms: 17.5 + 1.5625 = 19.0625
1.5625 + 2.5y + y2 = 19.0625

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 19.0625

Calculate the square root of the right side: 4.366062299

Break this problem into two subproblems by setting 
(y + 1.25) equal to 4.366062299 and -4.366062299.

Subproblem 1

y + 1.25 = 4.366062299 Simplifying y + 1.25 = 4.366062299 Reorder the terms: 1.25 + y = 4.366062299 Solving 1.25 + y = 4.366062299 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = 4.366062299 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = 4.366062299 + -1.25 y = 4.366062299 + -1.25 Combine like terms: 4.366062299 + -1.25 = 3.116062299 y = 3.116062299 Simplifying y = 3.116062299

Subproblem 2

y + 1.25 = -4.366062299 Simplifying y + 1.25 = -4.366062299 Reorder the terms: 1.25 + y = -4.366062299 Solving 1.25 + y = -4.366062299 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = -4.366062299 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = -4.366062299 + -1.25 y = -4.366062299 + -1.25 Combine like terms: -4.366062299 + -1.25 = -5.616062299 y = -5.616062299 Simplifying y = -5.616062299

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.116062299, -5.616062299}

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