4y^2+35y-71=0

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Solution for 4y^2+35y-71=0 equation:


Simplifying
4y2 + 35y + -71 = 0

Reorder the terms:
-71 + 35y + 4y2 = 0

Solving
-71 + 35y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-17.75 + 8.75y + y2 = 0

Move the constant term to the right:

Add '17.75' to each side of the equation.
-17.75 + 8.75y + 17.75 + y2 = 0 + 17.75

Reorder the terms:
-17.75 + 17.75 + 8.75y + y2 = 0 + 17.75

Combine like terms: -17.75 + 17.75 = 0.00
0.00 + 8.75y + y2 = 0 + 17.75
8.75y + y2 = 0 + 17.75

Combine like terms: 0 + 17.75 = 17.75
8.75y + y2 = 17.75

The y term is 8.75y.  Take half its coefficient (4.375).
Square it (19.140625) and add it to both sides.

Add '19.140625' to each side of the equation.
8.75y + 19.140625 + y2 = 17.75 + 19.140625

Reorder the terms:
19.140625 + 8.75y + y2 = 17.75 + 19.140625

Combine like terms: 17.75 + 19.140625 = 36.890625
19.140625 + 8.75y + y2 = 36.890625

Factor a perfect square on the left side:
(y + 4.375)(y + 4.375) = 36.890625

Calculate the square root of the right side: 6.073765307

Break this problem into two subproblems by setting 
(y + 4.375) equal to 6.073765307 and -6.073765307.

Subproblem 1

y + 4.375 = 6.073765307 Simplifying y + 4.375 = 6.073765307 Reorder the terms: 4.375 + y = 6.073765307 Solving 4.375 + y = 6.073765307 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4.375' to each side of the equation. 4.375 + -4.375 + y = 6.073765307 + -4.375 Combine like terms: 4.375 + -4.375 = 0.000 0.000 + y = 6.073765307 + -4.375 y = 6.073765307 + -4.375 Combine like terms: 6.073765307 + -4.375 = 1.698765307 y = 1.698765307 Simplifying y = 1.698765307

Subproblem 2

y + 4.375 = -6.073765307 Simplifying y + 4.375 = -6.073765307 Reorder the terms: 4.375 + y = -6.073765307 Solving 4.375 + y = -6.073765307 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4.375' to each side of the equation. 4.375 + -4.375 + y = -6.073765307 + -4.375 Combine like terms: 4.375 + -4.375 = 0.000 0.000 + y = -6.073765307 + -4.375 y = -6.073765307 + -4.375 Combine like terms: -6.073765307 + -4.375 = -10.448765307 y = -10.448765307 Simplifying y = -10.448765307

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.698765307, -10.448765307}

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