4y^2+8y-135=0

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Solution for 4y^2+8y-135=0 equation:


Simplifying
4y2 + 8y + -135 = 0

Reorder the terms:
-135 + 8y + 4y2 = 0

Solving
-135 + 8y + 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'.
-33.75 + 2y + y2 = 0

Move the constant term to the right:

Add '33.75' to each side of the equation.
-33.75 + 2y + 33.75 + y2 = 0 + 33.75

Reorder the terms:
-33.75 + 33.75 + 2y + y2 = 0 + 33.75

Combine like terms: -33.75 + 33.75 = 0.00
0.00 + 2y + y2 = 0 + 33.75
2y + y2 = 0 + 33.75

Combine like terms: 0 + 33.75 = 33.75
2y + y2 = 33.75

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 = 33.75 + 1

Reorder the terms:
1 + 2y + y2 = 33.75 + 1

Combine like terms: 33.75 + 1 = 34.75
1 + 2y + y2 = 34.75

Factor a perfect square on the left side:
(y + 1)(y + 1) = 34.75

Calculate the square root of the right side: 5.894913061

Break this problem into two subproblems by setting 
(y + 1) equal to 5.894913061 and -5.894913061.

Subproblem 1

y + 1 = 5.894913061 Simplifying y + 1 = 5.894913061 Reorder the terms: 1 + y = 5.894913061 Solving 1 + y = 5.894913061 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 = 5.894913061 + -1 Combine like terms: 1 + -1 = 0 0 + y = 5.894913061 + -1 y = 5.894913061 + -1 Combine like terms: 5.894913061 + -1 = 4.894913061 y = 4.894913061 Simplifying y = 4.894913061

Subproblem 2

y + 1 = -5.894913061 Simplifying y + 1 = -5.894913061 Reorder the terms: 1 + y = -5.894913061 Solving 1 + y = -5.894913061 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 = -5.894913061 + -1 Combine like terms: 1 + -1 = 0 0 + y = -5.894913061 + -1 y = -5.894913061 + -1 Combine like terms: -5.894913061 + -1 = -6.894913061 y = -6.894913061 Simplifying y = -6.894913061

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.894913061, -6.894913061}

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